Since comments are closed for now on the add-ons website, you can still post comment on my blog here ! Thanks :)
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This extension provides an easy way to control Songbird in command line with these switch :
-play
-pause (play/pause)
-stop
-previous
-next
-mute
-volumeup
-volumedown
For example in Windows "songbird.exe -pause"
It seems this feature is already inside Songbird (broken in version 1.0 ?), but I wanted something more easy and user-friendly to use.
If that help : https://developer.mozilla.org/en/Command_Line_Options#How_to_use_command_options
http://code.google.com/p/songbird-othersaddons/

mark32
Works well. Thanks! Here are some Autohotkey scripts to tinker with to create hotkeys that work whether Songbird is the active window or not:
#IfWinExist, Songbird
RControl & Right::
Run, C:\Program Files\Songbird\songbird.exe -next
Return
RControl & Left::
Run, C:\Program Files\Songbird\songbird.exe -previous
Return
RControl & Enter::
Run, C:\Program Files\Songbird\songbird.exe -play
Return
RControl & End::
Run, C:\Program Files\Songbird\songbird.exe -stop
Return
#IfWinExist