Does anyone know how to setup a wishlist but only get the SD version?

I know I can do this for HD (assuming its tagged correctly - and I am not sure they are).

I have an SD plasma and the HD just takes up more space and I can truely not tell the difference. Since so much of our broadcasts are replicated on both the SD and HD channels I have had wishlist (title) that have recorded the SD and HD simultaneously, which is silly.
I don't want to do a seasons pass as either the program is currently not shown or comes up on different broadcasts.

Any ideas? I also like the complicated version of recording only the SD but if HD is the only available then HD (dreaming)

thanks,