As far as I know, there isn't any way to modify this or to use a different editor. If you want to have changes made to the editor for future releases, I would recommend reaching out to Campaign Support and submitting an enhancement request.
As far as I know, there isn't any way to modify this or to use a different editor. If you want to have changes made to the editor for future releases, I would recommend reaching out to Campaign Support and submitting an enhancement request.