Unfort atm custom pois are server and client side.
Tho atm I am assisting guppy in trying to track all bugs relating to having custom pois server side only and hoping to get custom pois server side only.
if this can happen will be great for everyone, server owners and players alike.
but as for the mods zz is talking bout xml stuff is fairly easy to adapt. The cp is pure vanilla atm as for many reasons every new alphs custom blocks have to be updated so we would have to wait. then the prefabber/s would have to update their pois and then eventually the cp would update so after gold modded pois will be allowed.