wait a second... your making the commish out to be a cheater, but i think he was just making you an offer, however slick it may be... but it looks like an offer if your getting something in return, no?..
who is his 8th player?
if someone in the league feels that his #1 draft pick will yield a better player then that 8th keeper, then a trade-off would benefit them in their mind.. that sounds like a trade to me
it sounds tricky, but its not exactly collusion... the league loses out on a chance at his 8th player, but that will just switch to whoever your gonna drop, no? .. they are still gonna have a dropped player to choose from in the draft.... (if i'm wrong, please explain it to me) .. even if i am wrong, be careful with the commish... i might NOT suggest that "borrowing rule" to him... it may upset him because he obviously thinks its ok, and maybe it is
if i were you, i would make a counter-offer or suggest going to 8 keepers,,, it seems he really wants this 8th keeper, see if he will up the anti on that offer.. if he refuses, just reject it