welp, the z's gearbox melted down again, this time locking up cold. had it towed into my preferred dealer+service desk (instead of the original dealer), and they looked it over, declared that the original dealer had fucked up prep TWICE by not making sure oil had gotten in the crankcase and gearbox. ("how the fuck did you shift this thing???" the tech asked. "lots of preload!" i said with a stupid, mildly freaked out grin.)
rather than deal with warranty disputes myself, i traded my z to the dealership owner (who is also a friend, and) who gave me a more-than-fair price (plus he's gonna sort out the warranty for himself) and cut me a deal on this as a replacement:
2014 street triple r. not exactly the z, but hey, good dealers get my money. also, man, it PAYS to be nice to 'em. :-D