Its a shame that Unity does not support SpaceNavigator.
Yes. This has only been mentioned 5,278,692 times, so it's good you brought up this neglected topic again!
And there is absolutely no need to post once in three separate threads on this same topic. This thread is locked, I'm going to lock one of the others as well leaving one central thread, so any future comments about Space Nagivator support should be posted here.