Still considering, huh?
I have managed to create javascripts that create similar functionality in both IE6, 7 and Firefox, so if the ASP.NET team needs my help just shout out...
Another thing about this is that it messes up Ajax functionality in Firefox. With the dropdown, links' href are rendered javascript:void(0)". with the menu, it's suddenly __doPostback(...). Which basically means a full refresh of my page. Not what I want! I can't find a way to correct the href's for verbs either, if that were the case I could put the issue to rest.
S