Trail breaking

[Krackeye]

Most definitely. The best will trail all the way to the apex or the point where it's time to get back on the gas. I know it's an area for myself that needs big improvement so maybe treat my advice as with all advice on the www.
Obviously you are braking as hard as you can completely upright and the pressure at the bar is diminished as you start your tip in. Being on the brakes helps with turning the bike also.

[Linden]

Being on the brakes helps with turning the bike also.

That depends and needs thought yes compressing the suspension increases the ease at which the bike will tip in but remember increasing the front brake pressure will stand the bike up (the sidewalls want to be at the same compression) hence the panic braking issues of riders in a fright.

IE a little is good (compress the "slack" in the system) a lot not so good

[Nelso]

increasing the front brake pressure will stand the bike up

Not if your bike is set up well. You can grab a fist full of brakes mid corner on my ZX10 and it won't stand up. I think they only stand up if you are running too much trail.