Index: blender/source/blender/python/intern/bpy_props.c
===================================================================
--- blender/source/blender/python/intern/bpy_props.c	(Revision 26563)
+++ blender/source/blender/python/intern/bpy_props.c	(Arbeitskopie)
@@ -28,6 +28,7 @@
 
 #include "RNA_access.h"
 #include "RNA_define.h" /* for defining our own rna */
+#include "RNA_enum_types.h"
 
 #include "MEM_guardedalloc.h"
 
@@ -355,14 +356,16 @@
 
 
 static char BPy_FloatProperty_doc[] =
-".. function:: FloatProperty(name=\"\", description=\"\", default=0.0, min=sys.float_info.min, max=sys.float_info.max, soft_min=sys.float_info.min, soft_max=sys.float_info.max, step=3, precision=2, options={'ANIMATABLE'}, subtype='NONE')\n"
+".. function:: FloatProperty(name=\"\", description=\"\", default=0.0, min=sys.float_info.min, max=sys.float_info.max, soft_min=sys.float_info.min, soft_max=sys.float_info.max, step=3, precision=2, options={'ANIMATABLE'}, subtype='NONE', unit='NONE')\n"
 "\n"
 "   Returns a new float property definition.\n"
 "\n"
 "   :arg options: Enumerator in ['HIDDEN', 'ANIMATABLE'].\n"
 "   :type options: set\n"
 "   :arg subtype: Enumerator in ['UNSIGNED', 'PERCENTAGE', 'FACTOR', 'ANGLE', 'TIME', 'DISTANCE', 'NONE'].\n"
-"   :type subtype: string";
+"   :type subtype: string"
+"   :arg unit: Enumerator in ['NONE', 'LENGTH', 'AREA', 'VOLUME', 'ROTATION', 'TIME', 'VELOCITY', 'ACCELERATION'].\n"
+"   :type unit: string\n";
 PyObject *BPy_FloatProperty(PyObject *self, PyObject *args, PyObject *kw)
 {
 	StructRNA *srna;
@@ -377,7 +380,7 @@
 		return NULL; /* self's type was compatible but error getting the srna */
 	}
 	else if(srna) {
-		static char *kwlist[] = {"attr", "name", "description", "default", "min", "max", "soft_min", "soft_max", "step", "precision", "options", "subtype", NULL};
+		static char *kwlist[] = {"attr", "name", "description", "default", "min", "max", "soft_min", "soft_max", "step", "precision", "options", "subtype", "unit", NULL};
 		char *id=NULL, *name="", *description="";
 		float min=-FLT_MAX, max=FLT_MAX, soft_min=-FLT_MAX, soft_max=FLT_MAX, step=3, def=0.0f;
 		int precision= 2;
@@ -386,8 +389,10 @@
 		int opts=0;
 		char *pysubtype= NULL;
 		int subtype= PROP_NONE;
+		char *pyunit= NULL;
+		int unit= PROP_UNIT_NONE;
 
-		if (!PyArg_ParseTupleAndKeywords(args, kw, "s|ssffffffiO!s:FloatProperty", kwlist, &id, &name, &description, &def, &min, &max, &soft_min, &soft_max, &step, &precision, &PySet_Type, &pyopts, &pysubtype))
+		if (!PyArg_ParseTupleAndKeywords(args, kw, "s|ssffffffiO!ss:FloatProperty", kwlist, &id, &name, &description, &def, &min, &max, &soft_min, &soft_max, &step, &precision, &PySet_Type, &pyopts, &pysubtype, &pyunit))
 			return NULL;
 
 		if(pyopts && pyrna_set_to_enum_bitfield(property_flag_items, pyopts, &opts, "FloatProperty(options={...}):"))
@@ -398,7 +403,14 @@
 			return NULL;
 		}
 
+		if(pyunit && RNA_enum_value(property_unit_items, pyunit, &unit)==0) {
+			PyErr_Format(PyExc_TypeError, "FloatProperty(unit='%s'): invalid unit.");
+			return NULL;
+		}
+		printf("BPy_FloatProperty: %i %s\n", unit, pyunit);
+
 		prop= RNA_def_property(srna, id, PROP_FLOAT, subtype);
+		RNA_def_property_unit(prop, unit);
 		RNA_def_property_float_default(prop, def);
 		RNA_def_property_range(prop, min, max);
 		RNA_def_property_ui_text(prop, name, description);
Index: blender/source/blender/makesrna/intern/rna_rna.c
===================================================================
--- blender/source/blender/makesrna/intern/rna_rna.c	(Revision 26563)
+++ blender/source/blender/makesrna/intern/rna_rna.c	(Arbeitskopie)
@@ -32,6 +32,17 @@
 
 #include "rna_internal.h"
 
+EnumPropertyItem property_unit_items[] = {
+	{PROP_UNIT_NONE, "NONE", 0, "None", ""},
+	{PROP_UNIT_LENGTH, "LENGTH", 0, "Length", ""},
+	{PROP_UNIT_AREA, "AREA", 0, "Area", ""},
+	{PROP_UNIT_VOLUME, "VOLUME", 0, "Volume", ""},
+	{PROP_UNIT_ROTATION, "ROTATION", 0, "Rotation", ""},
+	{PROP_UNIT_TIME, "TIME", 0, "Time", ""},
+	{PROP_UNIT_VELOCITY, "VELOCITY", 0, "Velocity", ""},
+	{PROP_UNIT_ACCELERATION, "ACCELERATION", 0, "Acceleration", ""},
+	{0, NULL, 0, NULL, NULL}};
+
 #ifdef RNA_RUNTIME
 
 #include "BLI_ghash.h"
@@ -926,16 +937,6 @@
 		{PROP_LAYER, "LAYER", 0, "Layer", ""},
 		{PROP_LAYER_MEMBER, "LAYER_MEMBERSHIP", 0, "Layer Membership", ""},
 		{0, NULL, 0, NULL, NULL}};
-	static EnumPropertyItem unit_items[] = {
-		{PROP_UNIT_NONE, "NONE", 0, "None", ""},
-		{PROP_UNIT_LENGTH, "LENGTH", 0, "Length", ""},
-		{PROP_UNIT_AREA, "AREA", 0, "Area", ""},
-		{PROP_UNIT_VOLUME, "VOLUME", 0, "Volume", ""},
-		{PROP_UNIT_ROTATION, "ROTATION", 0, "Rotation", ""},
-		{PROP_UNIT_TIME, "TIME", 0, "Time", ""},
-		{PROP_UNIT_VELOCITY, "VELOCITY", 0, "Velocity", ""},
-		{PROP_UNIT_ACCELERATION, "ACCELERATION", 0, "Acceleration", ""},
-		{0, NULL, 0, NULL, NULL}};
 
 	srna= RNA_def_struct(brna, "Property", NULL);
 	RNA_def_struct_ui_text(srna, "Property Definition", "RNA property definition.");
@@ -978,7 +979,7 @@
 
 	prop= RNA_def_property(srna, "unit", PROP_ENUM, PROP_NONE);
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
-	RNA_def_property_enum_items(prop, unit_items);
+	RNA_def_property_enum_items(prop, property_unit_items);
 	RNA_def_property_enum_funcs(prop, "rna_Property_unit_get", NULL, NULL);
 	RNA_def_property_ui_text(prop, "Unit", "Type of units for this property.");
 
Index: blender/source/blender/makesrna/intern/rna_define.c
===================================================================
--- blender/source/blender/makesrna/intern/rna_define.c	(Revision 26563)
+++ blender/source/blender/makesrna/intern/rna_define.c	(Arbeitskopie)
@@ -1006,6 +1006,11 @@
 	prop->flag &= ~flag;
 }
 
+void RNA_def_property_unit(PropertyRNA *prop, int unit)
+{
+	prop->subtype |= unit;
+}
+
 void RNA_def_property_array(PropertyRNA *prop, int length)
 {
 	StructRNA *srna= DefRNA.laststruct;
Index: blender/source/blender/makesrna/RNA_define.h
===================================================================
--- blender/source/blender/makesrna/RNA_define.h	(Revision 26563)
+++ blender/source/blender/makesrna/RNA_define.h	(Arbeitskopie)
@@ -131,6 +131,7 @@
 
 void RNA_def_property_flag(PropertyRNA *prop, int flag);
 void RNA_def_property_clear_flag(PropertyRNA *prop, int flag);
+void RNA_def_property_unit(PropertyRNA *prop, int unit);
 void RNA_def_property_array(PropertyRNA *prop, int length);
 void RNA_def_property_multi_array(PropertyRNA *prop, int dimension, int length[]);
 void RNA_def_property_range(PropertyRNA *prop, double min, double max);
Index: blender/source/blender/makesrna/RNA_enum_types.h
===================================================================
--- blender/source/blender/makesrna/RNA_enum_types.h	(Revision 26563)
+++ blender/source/blender/makesrna/RNA_enum_types.h	(Arbeitskopie)
@@ -77,6 +77,8 @@
 
 extern EnumPropertyItem wm_report_items[];
 
+extern EnumPropertyItem property_unit_items[];
+
 struct bContext;
 struct PointerRNA;
 EnumPropertyItem *rna_TransformOrientation_itemf(struct bContext *C, struct PointerRNA *ptr, int *free);
Index: blender/source/blender/editors/interface/interface.c
===================================================================
--- blender/source/blender/editors/interface/interface.c	(Revision 26563)
+++ blender/source/blender/editors/interface/interface.c	(Arbeitskopie)
@@ -1429,6 +1429,12 @@
 	if(subtype == PROP_UNIT_LENGTH) {
 		return value * scene->unit.scale_length;
 	}
+	else if(subtype == PROP_UNIT_AREA) {
+		return value * pow(scene->unit.scale_length, 2);
+	}
+	else if(subtype == PROP_UNIT_VOLUME) {
+		return value * pow(scene->unit.scale_length, 3);
+	}
 	else if(subtype == PROP_UNIT_TIME) { /* WARNING - using evil_C :| */
 		return FRA2TIME(value);
 	}