Drop at level 0

 From:  moujiik
9411.1 
Hi, is there some way to put a selection at level 0 or whatever level? Some kind of shortcut eventualy?
I come up frequently after an extrusion or adjustement of dimensions with a solid flying at some altitude, witch is not very convenient. I need then to select the object, find a point to put it, etc...
Even better an option like drop at level "selection of a curve or surface"?
Thanks