I have never used a mouse playing Q2. Started out on keys with DooM years ago and never made the switch cause the few times I tried it I got motion sick. I keep telling myself I'm going to spend the time to get used to it, but I have such little time to play I just want to hop on and go. I'm pretty decent without it - especially on flat maps.
I'm curious - why is it hard to believe? That it's not possible? Or that nobody would be so lame as to learn that way and continue to play that way?