Okay, I've been chasing this for a little while now and I found something. If I open FBAPackWebPAges.resx from wwwroot\wss\VirtualDirectories\80\App_globalResources\ The contents of the Password Reset email are in "ResetPasswordBody". I've edited that and
put multiline text into it, but the problem is it all ends up run together on one line. No carriage return / line feeds at all. Maybe I should make a new thread about this though, since I've gone rather far from my original topic.
EDIT: Oh wow, this must have just been a stale page. I didn't see your reply until after I posted mine. I'll see if I can add this to the tracker because it would be a really nice feature to have.