Description
The editor toolbar is a dynamic set of buttons (some of them with sub-menus) that can be extended by plugins, and that are essential for the user-experience when editing the wiki pages.
To customize the experience, template authors, but also site admins, may want to customize the existing buttons, e.g. by hiding certain options (e.g. the underline format may not be compatible with some organizations' accessibility guidelines), or they want to replace the images with other ones that fit the look and feel of the template, etc.
At the moment, this is rather clumsy to do, and may lead to unexpected side effects (see e.g. this issue), mostly because there is no reliably way to address the various buttons for modification.
To remedy this, I suggest to simply use the already-existing possibility to give each button an id attribute. A pull request for this change is already in preparation.