Alright, rolling your craft with the scroll wheel would majorly suck. Rolling your craft with a mouse that has side buttons would also suck. This is why when you play with a mouse you program rolling left and right to two buttons on the keyboard.
The mouse is just plain different than the joystick although it is similar. So, when you use the mouse, you really can't use it in the same fashion as the joystick. That's why the mouse requires different motions and movement. That's why when you play with the mouse, you have to calm down and get use to it, so you ease into the controls. Another thing with the mouse is that your craft does not keep turning endlessly if you pulled into a turn. Jacking up the mouse sensitivity only does so much for the mouse in fs2. The mouse in fs2 isn't a joystick layout for a different device, it behaves differently in a huge way. Pulling on the mouse smoothly and not so fast will be no different than playing with a joystick. It's really the same fashion as being smooth and contented with the joystick. Moving the joystick in quick panicky motions doesn't get you anywhere except a more broken controller and not very good handling of your craft at all, and the same applies to the mouse on the handling of your craft part.
Anyway, people who must jack up the sensitivity in fs2 and windows for the mouse...i don't want to know how those people will handle a joystick, they will most certainly never touch my stuff.
It's like what everyone says, fight with your gf at her place.