In case you haven't noticed, SP2.1 has now changed (Fixed a bug) with how Feature scope works in feature with multi-bodies. Now when extruding, revolve etc. a feature, parts THAT ARE HIDDEN ARE NOT AFFECTED by the feature.
In other words, the Auto-Select Feature Scope now respects hidden parts and will not affect them.
This is the way that I think it should have always worked, and I lobbied hard with development to get it changed. They agreed, and have changed it.
Thank you Gopal and development team!!!
SolidWorks does listen.
And BTW, if you don't agree with this new behavior and hate it, you can blame me, not SWX.
Mark