I still don’t think its a major issue, and I’m guessing StudioPress doesn’t either or they would have changed it along time ago. But, that definitely doesn’t mean you have to keep it that way if you don’t like it. You could try and add your own custom css to make each sub menu expand vertically. Of course you’ll need to know css in order to do this. If not, then I’d just hire one of the developers around here to do it for you.
Hope that helps.
