I just found the Quicklists feature. I created a sample list with three items (from the scala plugin), called it "Scala" and wanted to assign a keyboard shortcut.
I took a while until I noticed that I first had to copy an existing keyboard shortcut profile to be able to assign shortcuts to the quicklist. (Not very user friendly).
I assigned "ctrl+," to the new quicklist. Pressing "Ctrl+," in the main window just shows a grey box with the quicklist's name in it, nothing else. I was able to type, but this just showed the typed characters.
So, how do quicklists work?