From reading the test reports (I don't actually ride, but follow the sport with some obsession
) Trail braking (that is braking to the apex) is something that some riders do occasionally, but with the big power bikes, it's mostly done in a straight line. Also matters which bike you're on, as some will sit up with the slightest brush of front brake, where others deal better with it.
That's probably got more to do with rider-specific setup though.
Tightening corner? Coast through and power-on later, or a touch of rear brake if you actually need to slow. Your turn in would be later too, to make the apex later. Cars have the same issue, as the last thing you want to hit when your tyres are at full side-load is the brake pedal - so there are few differences here between bikes and cars.
