On the English Wikipedia, Special:Unwatchedpages is nearly useless because it only shows the first 1000 articles. My suggestion is to split it into multiple subpages each based on the first character of the article: i.e. one for each letter of the alphabet, one for each number 0 through 9, plus whatever special character(s) would be needed (either all in one page, or perhaps one page for each?). The idea is that this would make Special:Unwatchedpages/A, etc. into useful pages.
This is related to [https://bugzilla.wikimedia.org/show_bug.cgi?id=12272] and [https://bugzilla.wikimedia.org/show_bug.cgi?id=10753].