quick set progress by click on ...% in appointment/task. save clicks.

[AJ]

should be the progress-bar be clickable?
i say yes.
quick example:
you may decide no to join an event but want to keep it in mind and so in calendar.
or more propably: you find out a task or appointment has much more to do or some parts can be canceled, you have to jump more levels at once.
as you can be disturbed or have an idea or have to get quick done, you better change it by one click!
i would prefer a vertical selector like traffic light!
for keyboard users changing by + - would be nice, didn't checked this one.