I run a very small private network and even with less than 100 members the activity feed frequently overflows past 20 in between my (frequent) logins.
Due to the intimate nature of the network it is critial that the admins do not miss important activity.
Surely it wouldn't be much work to allow the activity feed to show, say, 100 items.
Better yet would be a daily digest email to the admins or an admin section to see previous activity.
I'd be more than happy to pay for this feature if well implemented!!
Hari Karam Singh