I've got some clues to this one from searching, but wanted to make sure it was nothing to do with my setup.
I've been digging through my old games collection, and fired up Descent 1 after about 20 years, and trying to get to grips with the controls again. I've found that mouselook seems slow - even with sensitivity turned to max in the menu, it is still slower rotating than the keyboard controls. There's a lot of picking the mouse up.
Was this how it was meant to be? If so I'm happy to stick with keyboard controls even though it'll take longer to get my aiming down. I just wanted to make sure it wasn't something to do with my current computer setup. I've not interest in 'cheating' with hacks, looking for a fairly authentic experience.
I'm using Dosbox, just because it was already setup up, and gives me a chance to use Powermenu again, 20 years later.

Appreciate the time
Jon