Below is a message from the general RS forum, which I agree should be a wishlist item. Our office standard is the same:

I know this is going to sound a little picky, but our current standard uses lower case "x" in steel section tags ie W18x40 instead of the capital "X" ie W24X40. Mainly because we think they read better with lower case x's. Is there an easy way to change how these tags look?