Thanks for your reply, unfortunately this is the exact opposite of what I want to do. I need the width to stay the same (there's a background color/design so it would look strange if one sub menu item was 30px wide and then the item right next to it suddenly stuck out 10px more.
Is there really no way to have radmenu rmGroups have flexibility in their height? Since I'm using it in sitefinity where users can create menu labels of any length it seems like this would be a very common requirement as I never know what length they're going to enter. I know technically it can be doing using an unordered list and css, it's just that I can't figure out what it is in the base style sheet that is preventing it, yet if I remove the base style sheet the menu falls apart visually.
Any other ideas?