[Grind]

A 30 sec cooldown wouldn't be too bad. It would definitely help with the whole spam issue if you had to take up one of your armor slots for a self destruct button (good point that it should be pre-meditated).

I don't know about the graphic though, unless it's like a little patch on your arm or chest that just kind of lets people know you're crazy. Something like a big arrow over head is a little too much imo.

And at the same time, unless you get a good amount of kills (which isn't guaranteed) you'll be committing suicide so you'll get negative points for that (if they follow the usual FPS rules i guess). So that alone would curb a lot of the people who just want to blow themselves up over and over, and kind of save it for those who would actually use it strategically (suicide bombing sounds lame when talking about strategy, but it does have its uses).