I agree with the wish to be able to rotate habitats but I would add to that the ability to rotate buildings and other decor like the trees and statues.
Other wishes:
To be able to move and rotate the boulders, trees, and bushes/hosta that are originally on the islands. There have been many times that I have been forced to destroy one or more of these in order to make room for a habitat when I actually have another location where I'd really like to have a large green tree, or boulder, or hosta-like bush. And after all, we can move around the items we buy at the market, so why not be able to move the items already on the islands?
Though this may already be "the plan" anyway ... every once in a while -- perhaps once a year -- bring back the expired dragons (like apocalypse) for those folks who either weren't Dragonvalers at the time or tried but failed to breed them successfully to have another crack at them.
Oh and the ability to suppress or hide the orbs or crowns on the dragons of high level. While I like the benefit of raising the dragons to high levels, personally, I think the crowns look tacky. Not knocking those folks who like the look, just isn't for me.