Not to be a killjoy and it's a great suggestion to have this feature, but if lowering the video settings stops your game from crashing you either have a bad Video card, bad CPU or bad ram...
Perhaps, but I had a buddy whose WoW client crashed during shutdown every time, so he couldn't have any mods that required storing data. I don't know what the problem was and when he solved it, but it was a consistent problem for several months of the release of WoW.
That said, my client is totally stable at 1680x1050, I dunno what res you run. I've had one customer say he plays at 2500x1900 - crazy.
It could also be an OS thing, maybe. Who knows.
--
It's all in the reflexes.