Slingshot is not an actual indicator, it's just pretending. Ubuntu have intentionally limited application indicators to menus only to force some degree of consistency on them. In time it has backfired and now Canonical have come up with a library that provides hacks to get arbitrary widgets into their intentionally constrained menus.
The better idea would be to write a system indicator as opposed to application indicator. You'd be able to use any GTK widget there. I'm not sure what kind of embedding is used there, I haven't seen any docs on them, but I suspect you'll need Vala or C for that, and we strongly prefer Vala. However, it might be better to check your vision with the design team first. We're moving away from non-system-wide indicators. Also, we need some system indicators customized ( http://elementaryos.deviantart.com/gallery/37412343), getting that done would be stellar. -- Sergey "Shnatsel" Davidoff
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