This Rhythmbox's plugin allows you to send any song in your library or play queue at the beginning of the play queue.
To install, just execute the install.sh script; this will install the plugin locally by default. If you want to install the plugin globally (for all the users of the system) you need to use the '-g' option.
This plugins doesn't need further configuration after enabling it. Just activate it and enjoy.
You can let me know of any bugs or new features you want to see implemented through this repository's issue tracker. Also, feel free to contact me at my personal email account: asermax at gmail dot com.