1. Hard to say, maybe "auto-shoot if in range" good idea, need to try.
2. There are points of interest to show on minimap? Or to find oppnents?
3. Speedup, repair, stun enemy, make dummy copy of your ship while you invisible running, put temporary mines/vertexes.
4. 5. If say about IO games, you can do some like that where you are big worm and must take area as much as can. But in your cases use Islands for capturing or area from island to island. To protect you can put guns or even some kind of bases on it for points. Im sorry if it unclear, I am not a game dev :)
