Ah, ok then maybe I took the 'you can create as many fields as you want' a little too literally
www.joomlapolis.com/content/view/6547/1/
I've reverted back to using radio buttons now, as these give fairly similar functionality for users to update, and searchability can be done for a range, similar to the from-and-to option that the myrating stars had.
The speed of loading a page with 50 or so of these is no problem at all, so this is problem solved for me