I was also wondering if there was another solution rather than swapping tires, especially for the indoor/outdoor riding season overlap. I came across this article that talks about using duct tape over a mountain tire on a trainer -
http://forums.beyond.ca/showthread/t-299403.html - has anyone tried this on a road tire?
I was also wondering if it would work to cut the beads off an old tire and then deflate the good tire, slip the old tire casing without the beads over the top and re-inflate the good tire. I would think the tire pressure would stretch the old tire casing and hold it place. Has anyone tried either of these solutions? I may try this and report on what happens. It would let the old tire casing take the trainer abuse without having to do a full tire swap.