Dangerous Knowledge -- apparently Cannondale DOES make a size small 29er!
Their website does not reflect this, but our LBS owner confirmed that he actually has at least one size small Trail SL (not sure if it's 2, 3, 4, etc.) in the shop fleet...oh dear. :o He did point out that it's not "small" enough for a lot of riders, though, so it may still be a better idea for me to not get my hopes up that a 29er will work as well for me as a 26er. I'm just under 5'4" with a 30" inseam, so sort of in that area where a lot of 29ers are not going to be as ideal. I'll definitely have to ride both the 29er and 26er model of the bike to see.
I think DH is now well and truly frightened of me going to the bike shop any time soon. :p