Which shortcuts should be in our library and which not?

[Steffen]

I don't really like "Helper" because it seems to me as word cruft. It's like "thing" and "gizmo" and we don't use those either. I think we're currently using "Shortcut" for things that aren't really shortcuts. I'd rather see assemblies given their own proper part type instead of changing these which IMO are real shortcuts here.