Bruji

Does anyone know how to write plugin so you can get a field to write one line under each cover in the fullscreen mode. If you want to highlight special edition etc.

and a plugin that let you shift between collections (in fullscreen mode) by using the keyboard not the mouse.

Unfortunately the full screen view isn't customizable at the moment (via plug-ins or any other way). But we have it on our feature request list for the future.
You can navigate the full screen view with the keyboard though by using the Enter key and the arrow keys. (Enter brings up the menu at the bottom of the full screen view and the arrows let you move through the options.)