Helmet cams are pretty standard in aerobatic aircraft. The
best pilot I know, Rob Holland, records every second of his
flights and reviews them afterwards to see exactly what he did.
That closed-loop post-flighting is one of the reasons why he
is so good. He doesn't practice his mistakes, and he works harder
than any other pilot I know of. Unbeatable combination.
A good example of this is:
www.pittspecials.com/movies/acb_roll.wmv
I rather liked that four-point roll when I flew it, but as Peter
pointed out to me, if you slow it down, you can start to see
all sorts of small errors that need to be corrected to achieve
perfection.
I think cameras in the cockpit - pointed both at what the pilot
sees, and pilot does - are very educational, but this idea has
not been greeted warmly by the unions, I understand.
it's not a bicycle
Some pilots do too little. Some pilots do too much. My experience
is that a good approach leads to a good flare which leads to a good
landing which leads to a good rollout.
If you're Bob Hoover, you can do a magic trick, and somehow push
a bad approach into a good landing. If you're not Bob Hoover, don't
try to do that. When shit gets bad, your left arm goes straight and
you
get the fuck out of there. Set up again, apply the lessons you
learned from your last approach - eg compensate for a ridiculous
tailwind on base - and get a good one.
Another .2 in your logbook won't kill you. Honest.
This doesn't seem very complicated, but 91 people died recently
because my advice was not followed when a four bar tried to fly
a perfectly serviceable airplane in good wx, straight and level
from one very large airport to another very large airport.