summary window width

[Eric Abrahamsen <eric@ericabrahamsen.net>]

I have a pair of particularly wide monitors, and generally find that
splitting frames vertically is a good use of space. If the gnus group
buffer is on the left, say, and I enter a group, the resulting summary
buffer munches my whole frame. Is there a simple way to keep that from
happening? If the answer is something to do with a gnus summary mode
hook, I can probably figure that out by myself, but if there's something
more direct, I'd love to set it up so that ALL gnus window operations
take place on the left half of my frame...

Thanks!
Eric