Ok, now I know.

Contrary to what I find in the owner's manual and other places, leaving the battery disconnected for an entire week did not require the seats, windows or the IR remote to be synchronized. I haven't tried the sunroof, but somehow I doubt that any action is necessary.

What gives? My car did have the IFI computer changed before I got it, which mandated a new RLC (the original IFI computer did not ship with DAS of any kind). Is this the cause of this (quite acceptable) behavior?