Smaller sucker tube systems. You wouldn't need an extra tile to fit coins (course, if the tube is vertical, no problem), trigger zones, trigger scenery, whatever into a line of sucker tubes.
Tiles which can be triggered by multiple TriggerID's.
Tiles which can be destroyed by more than one weapon, just not all of them.
As Faw mentioned, Destruct Scenery and Hurt.

Maybe some more. Eh. Why do you want to know?