Hi,
requirement 1 and 3 would be something like this:
DEADLINE: <2012-11-11 So ++2w -2d>
, a repeated task with an explicit deadline for the item.
Regarding 2, the setting to DONE automatically bit:
May I ask, why you consider that? It doesn't seem really
useful to me; a status change, purely based on time, does not convey any
information whatsoever afaict.