Actually, this is a fantastic idea. I think, I could use that for having a suspended ceiling plan on the very same story where the actual plan is+ it would save me a lot of special ceiling layers+layer comb's or hiding transfer beams/slabs above.
On the other hand, I just wonder how to implement that throughout the interface - imagine having the 'hiding' level on above 1m say, what would happened if I went to the object tool window and set the object elevation above 1m, virtually I wouldn't be able to place it on the plan.
But definitely, this idea is worth of exploring.
::rk