p2 installer provides extension points?

Hi all,

I would like to know if p2 installer provide extension points. If yes, which are them?
I'm asking this because in all the discussions that I read before the developers are modifying the native installer behavior. Is this the expected way to do this?

I did not find a lot of documentation about the new p2 equinox installer functionality (the great part comes from the eclipse wiki) and the found one does not talks about this.

Reading suggestions are always welcome.

Thanks.