[Raapys]

I don't know. I've had run-ins with the Drushocka and Xi'Chung were they have proactively attacked me and any weakly colonies.

That only seems to happen if you live right next to the enemy or in the same system, though. If there's 1-2 systems or more seperating you you can basically be sure the AI wont attack( except sometimes early in the game, never in late game), from my experience. I'll try a few comp vs. human at maximum AI bonus and see how it turns out.

1.) The AI launches mines in the sector of his colonies: That's something I haver never seen before and just excellent!!

At which turn did you notice this? At turn 150 none of the 6 AI empires have put out any mines in my current game.

2.) The main empires are too friendly.

Definitely. 5-6 of them should be made war-like, very hard to make treaties with. Perhaps even do an Imperium Galactica twist and have a couple of races who *can't* make peace? Would make the whole universe a little more busy and interesting.