Regarding the mouse sensitivity, is the default too sensitive or not sensitive enough? Note that via the camera tool palette that comes up you can change the sensitivity via separate spin button controls for translations and rotations.
I imagine it will be free for quite some time if not indefinitely, or at least for the next year or more until I get it in better shape, and if I do charge for it, it will only be $20 or something like that. I haven't looked at anim8or yet, but I will sometime, having heard it mentioned a lot. What do you like about it?
Regarding the crashing, I've been fixing the ones I find, but I know there's plenty more. In reporting them, it's best you tell me exactly what you were doing when it crashed, i.e. what tool you where using, what palette was involved, anything that will help me reproduce it. "The instruction at..." messages can't help me much.