Upping the idea since I just realized it makes perfect sense, for special floors.
Would avoid the need to scout all the arena or spider's lair to find the rewards. (please, at least, consider scripting the map effect for those levels.)
Btw, this should be disabled on AoRA. The only "spoil" I can imagine is in Armory/lab. Military base's "secret" wouldn't be revealed since it contains monsters, and I doubt there is any other one I forgot.
reminder : the op's idea is to give computer map when level is fully cleared (name turns to blue), not after you left the level