Ok, this is another one that's totally obvious to me, but did not seem obvious to the creo developers. Why not put a simple ability to click on a part or any entity, and either with a hot key, or with a righ-click menu just template it on the spot, making it gray and un-pickable?
I.e. a simple semi-hidden mode, like Alias studio had for decades, where you're still able to see a curve or a part you might use later, but don't want it to be available for picking and want it out of the way. Talk about reducing motions and clicks and constant "hide" and "unhide" operations.