I've opened a server and will keep it online for the afternoon. I've played a little more and found some more suggestions and a bug:

Bugs:
-Sometimes the weapons energy stays at 100% and will only update again after you cleared it to 0 % and it rises up again. Don't know when exactly that happens. (EDIT: happend to me while i was the host of a game)
-Tried it on an older PC and after clicking join or host the game didn't start, no error message. By starting csis_engine.exe I found out that d3dx9_42.dll was missing. you could distribute it with the installer.

Suggestions:
- Enable dedicated server asap! I got the error that my Intel GMA 950 was too old for the game when i wanted to host with a game with my laptpo. I could keep a server online very often if dedicated server mode was implemented.
- Maybe make players that are staying still at 0 speed harder to find on the radar so its easier to hide somewhere
- Maybe make the ship shield regeneration rate a bit higher, since it takes forever to build it up a again if you want to save your expensive ship by hiding.

Again, its a great game already.