3) Other Roland MDX Upgrades

I'm not the only one beating an old horse... i have not done these but they are good reference, maybe.

joystick controller

http://www.cnczone.com/forums/general-full-3d-wood-router-machines/172105-software.html

similar

http://www.cpan.org/scripts/Win32/Utilities/

USB install

http://vonkonow.com/wordpress/2012/08/bringing-a-12-year-old-roland-mdx-20-up-to-date