I'm curious, are people interested in paging on the recent activity page?
I think an ability to search through past comments would be far more useful than paging. As it stands, each day accumulates more activity than one page. I've only been around for 75 days about, and that yields a whopping 75 pages of stuff to try and find one comment in. I imagine that any of the much older users, subsequently, have much larger page counts. So keeping the whole history paged, while it technically has its uses, I doubt that anyone will really be able to make good use out of it.
Subsequently, if it's only going to go back a few pages, I am rarely of need to extend past the most recent day's worth of material. Anything within the past week I can usually find via the Recent Activity envelope.
So I'd say it'd be useful, I just don't know that it'd really be useful to any good degree.
Aside from comments, the only other thing your activity summary tracks better than your profile page or envelope report is revisions you make. While I'm still of the opinion that some ability to search your activity will be far more useful than trying to page through it all, if the same-summary revision merging issue was removed, paging would be much more useful even without the ability to search.
I definitely have interest in this; the first time I saw the lack of it, I was rather distraught. It's good for referencing a comment you recently left, or similar things like that. Things that might otherwise be lost in history forevereverever...
...You are suggesting that the pages go back to forever, right?