I would highly doubt that it would work because (and i am not positive on this, so graf can correct me if i am wrong) the "ceiling" of the 3d floor is not a ceiling in the sense of how gzdoom sees it. The only thing that might work is "Actor hits fake floor" but I do not know if that only works with transfere heights. It is something you might just try. And if that does not work then it would be a good feature for graf to add.
You could use a combination of actor enters/leaves sector things and getactorz(). I did this to make an area where you push a barrel on top of a grate and when you stand on the grate too, it falls to a lower floor.
I won't let this degenerate into the state of ZDoom's Offtopic forum. Therefore I will remove any insults and close any threads that devolve into a pissing contest the moment I see them. Serious or not, it was inappropriate.
Sorry, just kidding around a bit. It's your forum obviously so I'll behave from now on :p wildweasel was right in his reply so I edited my previous post so his post wasn't right, giving me the right to call him n00b. I suck like that.