If you have the privilege to commit your changes yourself, you might do
so directly from the mail buffer, as the last operation before actually
sending the message. This is done by calling the function
patcher-mail-commit which is bound to C-c C-p c in the mail
buffer.
Committing directly from Patcher has the advantage that both the commit log message and command-line are constructed automatically. Of course, you still have an in-depth control on the commit process.