It does not appear that they are, sadly. There are "horizontal" and "vertical" controls listed, but they are for the movement controls and not for looking - looking controls, meanwhile, seem to be completely absent from the list.
Recent community posts
Just downloaded the game today after seeing the post on Tumblr, and I like it quite a lot, though I'm finding it hard to get used to the default mouse setup. Is there some way to invert the Y-axis, or are there plans to add such an option alongside the "Always Run" toggle?
Most of my testing was on GZDoom 3.2.5, and while I have not managed to reproduce the crash with any reliability, I can say enough to know it's persisted on versions as new as 3.3.0. I know it still exists - I just don't know where. The only commonality between any of the crashes I've had reported to me is that it occurred as the player died, but player death in itself is not enough to crash it.
I wish I could get to the bottom of that crash - I assume it happened as you died? But I can't figure out what exactly it is that has to do with the player dying that causes that crash, especially since it doesn't happen all the time.