I originally tried the roof opening from the key but it worked inconsistently (sometimes stopped half way). Inkey$, for the cost of a Gaptech, suggest you bite the bullet & get the fully monty one of these, u must have seen this link b4 http://www.z4-forum.com/forum/viewtopic.php?f=2&t=46926&p=789462&hilit=+gaptech+group#p789462
Probably the best £99 I have spent on my Zed
As for other things, thought srhutch may be able to assist