The camera will stop snapping behind you if you turn on Legacy movement.
/characterconfig
Control Settings
General tab
Movement Settings: Legacy Type (Camera-based)
Mouseovers don't generally need precision, though. The party list, the enemy list, the arrays for the other two parties in an alliance, your target health bar, your focus target health bar, and your target of target health bar are all valid mouseovers, and they are fairly large stationary objects.