tbh the vast majority of QW people just use cl_bob 0 so weapon bobbing isn't something I've really spent all that much time messing with, hence no left/right options.

one option is to set r_viewmodel_fov 70, which is still recently added and should reduce any stretching.

also make sure you don't have both vid_conwidth+vid_conheight lingering from other engines - those other engines tend to have screwed aspect ratios. As a general rule you should only use ONE of them, with the other set to 0.