Total Members Voted: 2
I'd make it a weapon that fires a temp brick-ish thing: Placeable like the Doors, but it's not a brick itself, it just spawns the "bomb" item. "Too Far" distance would be if there's anything between you and it, or a very short radius.
This idea is the best in this topic.An event-based time bomb would suck, it wouldn't be practical, you'd only be able to place it on your bricks, and on peoples you trust, and on top of that you'd have infinite of them. I recommend doing what Space Guy suggested.