when adding a new channel, the default settings should be read from the ECLogging.plist

[samdeane]

Currently I think the ECLogging list will only get used if there are no settings for any channels stored in the preferences.

That's a bit dumb - it would be better if the granularity was per-channel, so that if a new one got added and there was an entry for it added to ECLogging, it would be used for the initial settings.