(sorry, I tried to reply earlier using the "reply by e-mail" feature, but it seems this didn't work out well...)
Hello Scott
good to hear that you like the plugin. As Scott already said, the
wording of messages can be changed using the language customization
feature. Also, the word "Teacher" can be changed
on a per-scheduler basis, see the field "Role name of teacher" on
the "Edit settings" page.
For adding notes, there have been similar feature requests (see
CONTRIB-5343) and I'm planning to add this in the medium term,
though it won't make it into the next (i.e. Scheduler 3.1) release.
Best wishes
Henning