Feature Design Document
Discussion for future improvements
Relationship to other features
List of features that need to be tested when this feature changes, and why.
Region crossing - After you cross a region in a vehicle are you and the other passenger still sitting and playing the correct animation? What if you're not allowed into that region?
Attachments - Your attachment is a child of your avatar which is in turn a child of the thing you are sitting on. Does the attachment still work correctly?
Teleporting - What happens if you teleport while sitting?
Camera control - Does camera control work well while sitting?
Scripted permissions - You automatically grant certain scripted permissions when you sit on something.