I have to say I've tried a few different things to get the perfect shifting, from small mods to forcing myself to let the clutch out slower. End of day, the one mod that I was most skeptical of (based on its price) turned out to the be the best in terms of effectiveness - the Mason Engineering clutch pedal. I bought it after reading Bill's review but its really amazing, the engagement point is so precise. Between that, ssk, Jaffster, cdv delete and RE trans mounts I have *smooth*, precise, short shifts. I actually reverted to the stock clutch stop too.
http://www.billswebspace.com/BMWZ4MM...stallation.htm