Correct multi_accept implementation.

Make sure the defaults match with the Debian/Ubuntu packages.
I'm back again.

As said, I am just mirroring Debian's default but allowed the admin to change the configuration if required.
Any objections there? What would your take be?

I rebased my branch to upstream/master, in case you want to go forward with the merge.

If this will still take some time to review/settle, I could move forward with my other patches.

Cheers,
Raoul