Set other keybinding for multi-cursor

[baloe]

I can set multiple cursors by doing Ctrl-Alt-mouse left,
but how can I assign another keybinding for this?
I.e. what is the command I need for my keymap.cson?
I can’t find this key-combination in Edit→Preferences→Keybindings nor were my web searches fruitful.

[baloe]

btw. the default binding is a little annoying because one has to remember to release Ctrl first and then Alt.