Codemirror Customization

#1

I wonder how I can setup which button will be shown in my editor. For example I would like to hide everything except of the “Link” button.
Is there a customizable simple mode maybe?

#2

Not that I am aware of.

A local file search in the Admin Plugin revealed that the tool buttons are defined in /user/plugins/admin/themes/grav/app/form/fields/editor/buttons.js.