Thinking about this some more overnight, and I think the best bet is to have a config option to say "private notes sent by the system should come from user_id ##". That way it can then use a "real" user image, as well as allow a PN response.
If the value is NOT set (i.e. left at 0) then we'll default to showing the logo.
I think that is a good solution as it works "out of the box" as well as allows customization for those that want it.
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Brian Johnson
Founder and Lead Developer - Jamroom
https://www.jamroom.net
updated by @brian: 01/21/15 07:08:57AM