New version available:
http://code.google.com/p/il2coop/downloads/list
IL2Coop-0.2.0.15 fixes the host and client problems, no strange behaviour any more:
- Controls (Prop pitch, radiator) now work correct for the host
- Clients can start the engine as regular (engine temp is also normal)
The script finally works as intended.
There is no need to have AI control enabled in realism settings.
The reason for the strange behaviour was timing related. Obviously there has to be some time between mission loading that contains the aircraft, aircraft creation and the assignment of a player to that aircraft. I added a delay after the mission loading and the assignment of 3sec. which solved all the problems.