i requestet this for some time in the rmx-os thread...
i think its not possible

thats one of the reasons i decided to develop an normal rmxp game and not an mmo.
when i began with rmx-os i thought there where things like an auction house, instances party/alliance and such things possible but still nothing's out there.
even the battle system doesnt work correctly, pls say so if im wrong ^^ (ABS Controller)
so my tip for you is make an offline game ! but thtas your decision

(i know its hard to left all the work behind, i had 90% database,and 200+ maps with events still as i left the work...)
and sry for my bad english ^^