Ooh, nice catch! I don't think I can do that, at least not without some weird items. but I'll definitely keep it in mind.
But I'll do ya one better (arguably). I've already got the Dumb Luck feat from Complete Scoundrel that allows me to treat a Natural 1 as a Natural 20 on saves. I have to expend a luck reroll to use it, so I couldn't just do it any time, but I won't get a reroll on my natural 1s for saves so much as I'll just achieve success in spite of the roll.
I'm also looking forward to getting Better Lucky Than Good, which is basically the same feat but for attack rolls instead of saving throws.