So I was playing around with manual focus, kind of brought about when the AF mechanism died on my 17-55.
Since the focus points still work in manual mode, it occurred to me that you don't turn these off, instead you use these to assist you. In particular, turning on ALL focus points, and then manual focusing until the point you want focussed beeps in confirmation.
Is this how it's supposed to be done? Or do manual focusers just turn every thing off and use the viewfinder?
It also occurs to me that the 19 point AF on the 7D is amazing for this.