Yeah, I'm still attempting to revise the control issues. If this ever goes formal, I'll be applying options for the player to manually tweak the Mouse Sensitivity options. In the meantime, I'm still tweaking the controls so as to apply a reasonable default setting.
Maybe. However, I was originally envisioning it as a tribute to the old Descent games. (i.e. 360 degrees of freedom FPS).
Some of the areas I have in mind will be considerably more open with various inter-connected paths and corridors, so I would prefer a shooter that enables considerable freedom in terms of player movement.