Dropdown Menu when Mouseover
I actually had to create test objects to see for myself what you had in mind (meaning that probably it's not that requested of a feature).
It will certainly be better to have this, but not just at mouseover, I think it will be better at mouse click. On the other hand, the speed dial from what I understand it, is supposed to be big thumbnails and this feature won't quite fit. But that's just me.
Well, whatever makes people happy, if people want this, maybe the developers should reconsider it.
Does not have to be on a mouseover. From me even when you click on a tab. Headache you can navigate directly in the folders.