I used to make those. There was a lot of creative stuff people discovered.

For example, the game's terrain was baked at launch, so you couldn't turn land into water. But someone noticed that bridges seemed to spawn water textures under them (a cosmetic detail), and if you created a Bridge1 object and deleted it in the same trigger, it would vanish too quickly for the player to see, creating the appearance that water had appeared out of nowhere.

Someone used it to make an "ice-breaker" ship, which would turn ice to water (I think this required dozens of triggers for each point on the ice.) Some of these things had thousands of triggers, which the editor absolutely wasn't designed for. (It had no copy+paste function, and the window of viewable triggers was tiny.)

Fun times.