I am after clearing the Absorption gate, I have the whole party, and I went to Sheridan. I noticed a metal staircase on the left side of the meeting hall/inn, and used Mieu to kick the sort of small yellow metal switch sitting there. The steps/metal ladder rose, and climbing them got me to the left side of the inn rooms, just outside the inn, where the "save" spot is (at the left of the save spot). There is another metal yellow-ish switch that I activated using Mieu, and some sort of wheel started turning on top of the inn's roof. There's another similar switch in front of the meeting hall that activates the fan in the ground in front of the meeting hall, and a fourth switch on the side of the town that when activated makes the water level in the Sheridan...er, bay (?) rise and fall.
Most of those switches I haven't noticed before - but the one that creates another staircase to the inn... well, it creates another stairecase to the inn. That's all. There are sidequests in Sheridan, though, like the Blacksmith.
C-A --- Cloud and Sephiroth - battling each other since '97 for your amusement Give it a rest already!