If you do Master Sketch/Skeleton modeling, you need KWiKInsertNFix. KWiKInsertNFix eases working with Skeleton or Master sketch assemblies. It allows you to multi-select parts and assemblies, set if they are to be adaptive or reference, and if you want them inserted grounded or with the origin planes flush mated to the assemblies origin planes.
There is no messing around trying to get each component constrained to the origin, it happens in seconds. If you prefer dragging and dropping components into your assemblies, then buttons are provided to select existing components and flush constrain or ground them to the origin.
The app works for a 30 day Trial