Today the normal mouse speed is controlled by the speed set in "Magic Mouse" settings.
This is an issue as most regular mouses operate in a much higher DPI than the magic mouse, and it will move much faster and will be unusable.
There should be a different speed control for regular mouse, which will solve that.
I need this too
Can confirm the issue is still present. Changed the Mighty Mouse speed and it affected my Razer Basiliski speed as well. Pretty annoying.