The gtk client has support for a command line switch --minimized which is supposed to start the application iconified in the notification area, but it has no apparent effect. This is an upstream bug which has been fixed in svn trunk. I propose including a backported patch.
Created attachment 150399 [details, diff] fix from trunk
Created attachment 150401 [details] Updated ebuild for net-p2p/transmission
Created attachment 150467 [details] Updated ebuild for net-p2p/transmission-1.11 I just noted that 1.11 is in portage, so I check in the appropriate ebuild
Fixed with 1.20