Let us delete part of a modular item

This is a basic requirement and still none of the modular items allow it. I'm sick of building a shelf or a playground and wanting to remove a single piece, yet all of them or at least a few select at the same time and I can't select them individually. Especially when the modular system is so dodgy that things won't always snap together in the first place. A simple shift click should be easy enough to implement, just like the wall trims.