Reference topic : http://rathena.org/board/topic/84169-specialty-shops/
Pull Request : https://github.com/HerculesWS/Hercules/pull/232 (Tested it out, and its working.)
Diff File: SpecialShop_v1.2.diff (In case someone want to use it early/dev rejected it.)
I have tested this source, and it works fine, anyone who wants to try can test it.
Although in cashshop rearrangement, we would like if format is this
<map name>,<x>,<y>,<facing> pointshop <NPC Name> <sprite id>,<"points">,<"description">,<itemid>:<price>{,<itemid>:<price>...}
Where description is the name of point put, like if variable if PkP and description is PvP Points. Then when we open shop it will show in chat box (not npc dialog box), that "This shop uses PvP Points for purchasing items. Current PvP Points:123"