I have a couple of questions about collisions

[ditto]

I decided to try making a game this pyweek with pyglet. I couldn't
find a tutorial, and have a couple questions about collisions:
can you have collision boxes slightly smaller / larger than their
sprite image, can you displace the collision box?
the left, right, top bottom, x, y are all absolute, left to right,
bottom to top?
the x,y start on 0 on the bottom left, like the default on pyglet
sprites?
thanks!