Category Tags should work like Multicategory Tags with a type dropdown.
When you tag an electrical fixture (for example) with an Electrical Fixture Tag, you are locked into using whatever tag is set as the default or last used ElectricalFixture tag. BUT, if you are tagging the same device with a Multi-Category Tag, you get a dropdown list in the Type Selector that lets you select from all the loaded tags WHILE you are tagging.
It would greatly improve (speed up) the process if the normal category type tags worked that way.