Enhancement Request: Mouse speed modifier button for handheld mode

[MHzBurglar]

I was wondering if it would be possible to implement a 'mouse speed modifier' button to make switching between course/fine mouse movement a little easier in handheld mode.

The basic idea is that there would be two mouse speeds defined in the core options: a 'slow' (default) speed and a 'fast' (modified) speed. If the user holds a button on the Pocket while the d-pad mouse is in use, such as Y or X, the 'fast' mouse speed would be applied to the d-pad mouse movements instead of the (default) 'slow' speed.

Playing a game like Lemmings with the d-pad mouse isn't really possible at the moment with just a single defined mouse speed, as both fast and slow mouse movements are needed pretty much on the fly.