I'm working on a new extension that will make it easy for other extensions to create their own settings pages. Right now it works but it's still in beta. I haven't written the documentation yet (it will be long) but I thought I'd toss it out there and see what folks think.
The easiest way to see how SetList works is to look at a simple extension that makes use of it. Downtime is my old Mary extension, slightly tweaked to work with SetList.
I'm pretty proud of SetList. It's small, it's easy, it doesn't require any special tricks to install, and other extensions that use it will still function normally even when SetList isn't enabled. Please let me know what you think.