Blame told me how to do this some time ago, but I don't know if he ever made a post about it.
You can do this at anytime and it's easy as hell to do, it just an annoyance that it doesn't do it automatically.
Here is how it's done:
- Make any and all changes you want
- Go to options
- Change the sensitivity setting by one click left or right (You can change it back once you complete the last step)
- Leave options, and then hit save when it prompts you to do so
That's it, easy but annoying. I personally find it best to do in the "Test Range" cause you can mess around with EVERYTHING and not worry about time running out or anything. Again you can do this in mp as well.
Hope this helps!
Mechos out.