Can you change the gearbox controls from a standard 4 Speed auto like this:
http://i896.photobucket.com/albums/ac169/Cuffy01/DSC00184.jpg
*stole the pics from someone's post*
To a tippy shifter control like this one?
http://www.goauto.com.au/mellor/mellor.nsf/0/750AECF1E84C364DCA2569EB00176D3B/$file/2001.2.7NADP001traaMitsubishiMagnaSports.jpg?OpenE lement

If you can, what is required, do you need a whole new gear box or just the control module

I think this was cleared up in this thread;

http://www.aussiemagna.com/forums/showthread.php?t=89325&highlight=

Shifter, BEM (and keys/locks) and ECU... and dash if you want the shift indicator.

I'll be doing this conversion in the next few weeks so we'll know for sure.