OK, so my speculation was wrong but the reason seems to be found. ;-)
Getting really close and even ramming is fun - wonder if it would be cool when ramming causes damage or if it would brake the game. Guess it could work when the damage through ramming would be very little. (Actually i also like it as it is now - ramming only for tactical reasons with no damage at all.)
Looking forward to the next update.
Thanks for clearing that up so quick!