Edit: I also discovered that there is now a "Patrol" link which you can choose to enable under Forum Profile Information.

Partrol isnt new, I have been using it for ages.

why satoshi has only 250 merit?

363 activity, thus senior member.
Motion to give satoshi 21M merit.

So far, it seems all legendaries have 1000 merit, all heros have 500 merit, senior members 250, full members 100, members are at 10, newbies at 0.