See the thread on the TVFree/CTM/etc started by SHADOW4.
http://e89.zpost.com/forums/showthread.php?t=402303
A company in germany does a pure software fix (no wire cutting or chip replacement) that alloows you to open and close the roof from outside the car and also while you travel up to 40km/hr.
http://www.prochip.de/e89
Shadow has organised a discount on a bulk buy - send him a PM with your email and interest level.
(Oh, and it can also fold your mirrors on locking if you have the folding mirror option fitted)