Mouse sensitivity can only be adjusted in 0.2 intervals in the GUI
From the GUI the "sensitivity" cvar can only be increased in increments of 0.2
I have a friend who plays some other Quake engine based games on an odd numbered decimal sensitivity setting and won't play Xonotic without the same settings.
I'll tell him about the cvar and how to manually edit it but I feel like other people might be in a similar situation and won't have a someone who will help them find a cvar.
I hope it's a simple enough usability fix...