Walt Question #5: Can players self-destruct to respawn themselves?
As I see it, self destruct should be a feature for players. It negates any problems with players being left freely floating in the arena, waiting to get killed. However, like you said, it could be cheaty to deny points by self destructing themselves.
However, my solution to question 3 and 4 could negate the problem of denying points, as players will recieve points based on the damage they did in the last ten seconds, meaning a player finishing off a ship, still gets the points even in a self destruct.
My other solution would be to have a 5 - 10 second (physics time, not real time) delay before self destruct sequence starts. This would mean it would be impossible to start self destruct sequence without anticipating battle, and since most battles will last no more than 5-10 seconds between any far superior ships.