i just come back from holidays, and wanted to see what had changed on MoodleDocs in the past 6 weeks.
The problem is that i can't have a recent changes from more than 30 days, and/or 500 changes, even if i try to manually specify bigger values !
Specifying 90 days shows a little more, but NOT all that has been modified in the last 90 days.
I know because I HAVE modified files (on french docs) between 90 days and the latest shown...
I think there is perhaps hardcoded values somewhere...
If you try http://docs.moodle.org/en/index.php?title=Special:RecentChanges&days=30&limit=500&hideminor=0 and http://docs.moodle.org/en/index.php?title=Special:RecentChanges&days=30&limit=1000&hideminor=0 you'll see no difference (it's blocked to 500, even if 1000 specified)
More details here : http://moodle.org/mod/forum/discuss.php?d=156779