Consistent use of element status property

Two issues regarding property Status.

1.
Many of the recently added IfcBuiltElement subtypes do not have property Status in their Pset_XxxCommon (in some cases such Pset does not even exist):

IfcBearing
IfcCaissonFoundation
IfcCourse
IfcDeepFoundation
IfcEarthworksElement
IfcEarthworksFill
IfcKerb
IfcMooringDevice
IfcNavigationElement
IfcPavement
IfcRail
IfcReinforcedSoil
IfcTrackElement

IfcBuiltElement, now being non-abstract, also should have Status (as should all instantiable subtypes of IfcElement).
Status (and possibly Reference) should be in Pset_ElementCommon, applicable to all IfcElement subtypes?

2.
PEnum_ElementStatus value OTHER is unclear: how should it be treated differently from UNSET? Following the same logic as in PDT enums, it would be USERDEFINED, and there should be a property (UserDefinedStatus) to capture the value.