Code review comment for lp:~jr/bzr/707274-commit-message-hook

@spiv: I seem to remember you had a deep discussion in this area but I didn't participate nor remember the details. I have a vague feeling that this proposal is not doing the Right Thing but I can't put my finger on it. Care to review it ?

@Jonathan: I really hate spreading FUD on proposals, so wait for spiv input before worrying about me ;)