In reply to:

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I like the idea that it could be constantly scanning and updating the signal-strength map in the background, no matter what you're doing.

Well, OK, it wouldn't work too well if you were listening to MP3s and your antenna was down (or the antenna amplifier was not powered).

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You'd want to have a configurable option (or a setting) to power the antenna at all times, I guess. This issue also comes up when RDS TA (traffic announcements) gets implemented, and you want it to interrupt MP3 or Aux playback.

In case it's not obvious, by "option" I mean something in the config file, and by "setting" something set on the front panel.