Recently Richard Hughes added the addon component type to AppStream
which is an XML standard that is used by distributors such as Fedora,
Suse and soon to be Arch and Debian to create metadata for various
software center applications.
By creating a metainfo.xml for gimp-lqr plugin, it is then shown next to
the main "gimp" application and allow the user to easily install it.
Richard written a blog post about what upstream software needs to do
to integrate with the KDE and GNOME software centers, and Richard really
appreciate any feedback and help at this stage. The way AppStream works
is that it has to be build upstream by the distro, so we'd need to have
the files either upstream (or downstream in the distro packages) by
GNOME 3.14 which is quite a few months away.
If you want to contact with Richard, either email or grab on IRC — He's
hughsie on freenode and gimpnet. I'm ignatenkobrain on freenode and gimpnet.
Or just ask here.
I already sent patch to gedit-plugins. Take a look it.