there was exploit with dupe coins, but was 2 times few days down time, and admins fix it
after first down time cuz of it all ppl that has more than 300 coins got ban and was big mass on server cuz of it
anyway even if it worked ( rly i think this was more coplicated that you wrote) already is fix
p. atc pots you can set in l2w settings - you don't need scripts - go to "buffs" window, last 4 buff slot, are for pots, if you don't have p. atc potion on buff list, for sure you have some empty slots on this list, try use empty slot - one of it is p atc pot
ol/ee - best selfbuff in game ( you need only bd to have full ofensive buffs, ofc song are also nice)
archer/ol - nice p def and p/atc ( imo better than archer/wc)
bishop/wc - very nice suport char
destro/pal - check it out:)
imo this are best x race subs
full buffed archer party > full buffed mage party
archer is very nice for mass pvps,
mages are better to play alone ( best for this is ol/ee if your server has mutants)