Re: 'In gear' vs 'handbrake on'
For a manual transmission, park it, apply handbrake just enough to hold car (don't yank it as hard as possible and stretch the cable, as is the habit of someone I know), put it in gear and before turning the engine off, turn the wheels so that if the car does roll, it rolls up against the kerb. Wiggle the steering wheel to engage the wheel lock.
When getting in, before sticking your foot on the clutch, make sure your other foot is on the footbrake, just in case!
If the car is left for some time then yes, the pads might have bound slightly, but they'll be fine once you're moving, and by not putting the handbrake on cable-stretchingly hard, you have a bit of wiggle room.
Works around here anyway, and we have some pretty steep roads and driveways to deal with, didn't take long to work out that it wasn't worth taking a chance.
On some very steep roads near here, sometimes people park at an angle and creep until a wheel is just touching the kerb before applying brake etc. Friends live on one of the steepest roads, and on that road, people park perpendicular to the kerb. Good thing it's not a through road. Explore that area and you'll probably find most cars parked with wheels turned. This car shows examples of all the techniques!
M.