(2). Action [Script] Buttons. You can show up to 12 of them in Preferences > Toolbar
(1). Yes you can. Menu > Window > Keyboard Shortcuts Tab “Editor” LuaAction
There are up to 32 slots (by default), the first 12 correspond to the buttons in the editor. the rest can be set in Menu > Edit > Lua Scripts > Script Manager > Action Scripts
Damn… and after 1hr of work just to find out that github user MrHeadwar was faster than me… He just yesterday created a Doc pull request with almost identical intention…
So, I guess I’ll withdraw mine… to avoid confusion at the Ardour team.
Sry.