If so, I've never done it, and it's not easy to pull off. Just tried to do this under normal conditions, to no success.

Sean: if you only have one tile available, a spring is basically your only option. Any trigger system will, for technical reasons, use at least two tiles, since you will be using at least two events. You can cheat this if you use reworder trickery to make the tile triggered be on the same tile as the event, but you'll still need to have the "real" trigger scenery tile somewhere in the level. If you do this, good luck with the masking because players will get stuck easily with most tiles.