I thought I'd abuse the benevolence of the PD forums, instead of turning my music-time into google-time.
It seems to me that readsf~ will always read at the sample rate PD is set to, and not at the rate of the file. My brief googling suggests this is true, as well (at least as of 2004).
I'm working on a collaborative project and, since my partner's a nerd, I'm getting lots of files at 48k and even 96k. Also, since I'm a slob, my own sample rates are all over the place (yes, it's basically a buddy-cop comedy).
So, before I start resampling all the files I might use, I just wanted to make sure I wasn't overlooking a simpler solution.