The original idea for floating bricks, build through and the Editor Wand was to fix glitches with the brickstack - entire builds collapsing even though they should have been supported, bricks counted as "Inside" when, in fact, they weren't, etc. Now that these glitches are gone there is no real need for them. If you urgently need a 34x4x2/3 brick, use one of the brick generators or three other bricks instead.
Wrench Events in v9 should help the "Doors and Switches" thing.