For designated Wilderness, the Forest Service policy is to provide directional trail signs at junctions but "interpretive" signs, which include summit signs, are not allowed. As sign maker for Wonalancet Out Door Club, I have been directed to NOT place signs at summits in Wilderness, which include all the summits within the WODC trail system. The only summit you will find signed is East Sleeper, which I put up as an individual (without the blessings of WODC or USFS) after the sign that Gene Daniell put up disappeared. The reason being: the summit is so flat and the trail dead-ends there so that without a sign people tend to wander around to be sure they found the summit, causing quite a bit of soil compaction and trampled vegetation. The remaining summits (Whiteface, Passaconaway and our two 3000 footers) don't seem to suffer from this problem, with the exception of West Sleeper, which I believe is on the Trailwrights list.
Something to think about: If you want the federal version of Wilderness, then you will have to put up with fewer signs, shelters and designated campsites. If you don't think the tradeoff is worth it, then you better pay close attention to the WMNF Draft Environmental Impact Statement and Proposed Plan, which is due out any time now, and make your thoughts known during the public comment period.
Edit: Opps, my mistake. West Sleeper isn't on the Trailwrights list. It isn't even a 4K peak. Maybe it used to be on the NE100. For whatever reason, it tends to get visited frequently enough to receive a distinct impact.