Inside a limbus, i am (florius) the only one that open chests.
Concerning coins, an officer will be in charge to lot all of them. At the end of the limbus, all coins will be share between all members. If there's some remaining coins, /random will decide who gets more coins.
You can comment any job for AF+1 materials, as long as it's lvl 73+. Obtaining an AF+1 materials will cost you one point. If you don't want an item, you MUST pass it. If you get it, you'll be charge, no matter what, even if you didn't unlocked the job. You have the possibility to attendance lot (AL) an AF+1 material. AL cost 3 points, if two or more ppl AL the same item, the one with the highest point win.
You can't lot on your first run, unless it's free lot.
Synthesis material are free lot ^^.