Last modified: 2011-03-13 18:06:20 UTC
That is not really possible without querying once for each user, I think.
This isn't gonna happen, because it would allow for huge limits (uclimit=500&ucuser=A|B|C|....|Z would give 13000 results) and lots of DB queries. Even if this were to be implemented, it would hardly be faster than simply doing 8 requests.
So you're just gonna have to do: