Add a class to child menus for "menuchild" as opposed to "menuparent"

Hi guys
I find the menuparent is useful but I think a "menuchild" class in all child objects would be useful.

I currently have a menu which has curved corners. I don't want the submenus to have curved corners but the first and last item in each menu was getting a curved corner. The problem is I couldn't find a class that affects all child items that does not also affect the parents. Using first, odd, even, or last also adds theming to the parent.

In order to remove the curved corners I've had to add a css entry for each "menu-0000" that in a child menu and picks up the corners incorrectly. This works but every time I add a new submenu I have to edit the css file to add the new "menu-0000".

I am convinced that the children are picking up the curved corners incorrectly and I'll try and solve this but I think the menuchild class would still be useful as it would have solved my problem and I'm sure someone else must have had this before.