The pychiatric profession tends to define a behavior or dependency, however obsessive, as a "disorder" only if it interferes with your everyday life on a frequent or extended basis. So for instance they have no problem with men who like to wear women's underwear under their clothes if it doesn't affect their outward behavior. Just to pick an example. Completely at random.
Anyhoo... I think I'm approaching the "disorder" threshold with my DVR. My dependency has followed the following trajectory:
Bad: I get frustrated at hotel TVs because I can't back up or pause a program
Worse: I go to pause the car radio when the cellphone rings, then remember I can't. Again.
Worst: I suddenly realize I zoned out the last 3 minutes of a conference call at work, and reach for the "backup" button
I'll know it's time to seek treatment if I reach the final stage: reaching for the "backup" button during a face-to-face conversation...