Wow. Found something in the Multisite Network admin Screen Options I did not know was there.
Context: I was once again trolling through the Newtwork/Sites list table, 20 per page - click click click - very tedious - looking for abandoned blogs to trash.
After spending a few minutes scouring the backend admin code looking for ways to increase the length of a list table to more than 20, I discover that it is hidden in plain site under Screen Options.
So I increased the number of rows from 20 to 200 per page.
Wow, thanks WordPress coders! I have no idea how long that little gem has been hiding there.