There is another pretty annoying problem when setting up multisites.
You can't actually reach anymore the last entry on the bottom of that long menu of sites in some browsers. Is there a way to break that up and to get the menu shown in columns (would be much better then scrollable) - better to keep an overview of sites if there are no more which would fit on a full screen HD (depend on screensize of course)
Or to make that menu scrollable
i.e. 100 sites won't fit in there so how to do if you have 1000 sites or even more in one multisite? How to manage those sites easily