Complain!
Seriously, though, it seems like there's a lot of complaints out there about the ending. Gamespy has an article in which the author said he found out that there were a bunch of ending events that were planned, but never implemented on account of the production deadline. I'm not suggesting that if enough people complain that they'll actually go back and put the scenarios in the game in some kind of huge patch. I'm just saying that perhaps the growing disappointment in such will make Lucasarts rethink their policy on forcing games out before they're ready.