displaying the number of read-but-not-expirable articles in the group buffer

[mwahaha]

I don't know if many people do that but I usually read email, then
often process it later. And with gnus, when you've read a message, you
have to mark it unread if you want to see it again (at least with my
setup).

After 10 years of pressing ESC-u, I'm growing older and often find
myself forgetting
to do it, so I changed my setup to display read-but-not-expirable email
(((display .
[not expire])). This works well, but in order for the numbers shown in
the group
buffer to be consistent, it would need to be able to show the number of

read-but-not-expirable messages. Is it possible?

M.