warning : Forget my clumsy english, I'm a foreigner.
I thank you all a lot for your detailled responses. This forum seem to be of a very high level regarding patience and proficiency.
I wont comment on stars! pro and con. Having been a fanatic of stars! I would be too partial, even if I recognize quite a lot of better features in SE IV.
There is only an answer I would comment, it's on the usefulness of all weapons. I think that even if you can mod it to your liking, I suppose that most of the players in PBEM/PBW will play with the official release to avoid endless discussions. So for a specific example, I would use the anti-matter torp line of weapons. Frankly how can you use this thing? This weapon is inferior in all other in all stats. I looked in the components.txt hopping for a hidden to hit bonus that will change my point of view, but no bonus either...
Ah also... I just forgot the main point. I have never been able to start preparing my PBEM turn save it and resume the planification afterward. I cant imagine that I must plan my turn in a single session really (stars! permit it yes

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Just tell me how you do !
thank you all for your input. I think I will stay a while in this forum ;o)