this is more feature request than support questions.
I install WPMU with 30 subdomains. If I go to the admin menu, move cursor to my site (on top links menu) I can see 23 sub-domains - so 7 sub-domains and more are out of screen.
I have 19" LCD with small resolution 1366x768px.
My tip is here to move the subdomains next to the first columns.
Look to the printscreen. link
FYI: the site is under construction, and in another language (Czech).
Data:Ubuntu 12.04,chrome and FF too.