Well I've gone over the script a little and here are some ideas, maybe.
1st Your project would get even more attention if you make it work with
Those two + Your rpg mod would work wonders, people can post, earn gold, buy items
and use those items in the rpg like what was said in your script
Gear can effect various stats, like increase stamina or do extra damage to a dragon or even help out in PvP (depending on how that system works out)
So users could buy grear using those two mods and make it work using yours, maybe so that
any gear put into the store can be edited by admin in the acp to have certain effects during
Plus it was mentioned that items could be found whilst posting which is a great idea, that may give
users the ability to trade with other users, using all the mods together. Sell the items back to the
store and make some extra cash to buy better items to use in the rpg.
Experience - Posting, people replying to your topic - Good ideas.
How about experience for getting friends to join the site. Good way to get more members.
Maybe you can somehow add not pvp but pve, where when posting people can run into
monsters, so lets say you have forums with different level monsters and on posting in that
forum you can run into them be "luck" and depending on what lvl the monster is "random" you
will gain a certain amount of XP and lose a certain amount of MP.
Maybe users can chose what level monsters they would like to encounter, max 5 levels ahead of themselves,
giving them an opportunity to gain more xp by facing higher lvls but also losing more hp
IF they have not got any good Gear.
I am full of ideas, I'll go over it a little more and post something again a little later.
EDIT : Ok i had a little vision, the xp for people replying to your post is a bad idea if you
work with a board currency as later on "rich" users will pay "poor" users to reply to their topics
making them lvl up faster and easier.