@mwmentor
If I understand you correctly. You should edit file: modules/Emails/include/ComposeView/EmailsComposeView.js, object: $.fn.EmailsComposeView.defaults
from:
toolbar: ['fontselect | fontsizeselect | bold italic underline | styleselect'],
to:
toolbar: ['fontselect | fontsizeselect | bold italic underline | styleselect | bullist | numlist'],