Dell U2913WM 2560x1080 21:9. If someone can tell me a good tweak to achieve what I want then that will be acceptable, rather than having an obscure aspect ratio added to the options...
fovTop=0.75;
fovLeft=1;
I've read that these two settings control it, but I haven't been able to find a good number. It's either stretched too horizontal or too vertical.