I believe it would be a lot more convenient to allow the user to directly type numbers into mediator.
Example: Changing the Lift Gamma Gain's XYZ Gain settings from 1.0 to 0.850. Instead of using the mouse&keys to delicately navigate the small marker, it would be faster to just type "0.850" as if you were manually editing the raw CFG files.
Not saying REMOVE the keys&mouse support. Just have it to where you can click on the actual numbers instead of the marker to type what you want.