all these restrictions seem to defeat the spirit of the battleground, that is to say: blacraft is a primarily pve server where pvp is only allowed in the battleground. Now it seems that pvp too is banned in the battleground, and you are only allowed a watered-down version of fighting.
instead of banning items, maybe people should just come up with ways to counter them.
diamond tools and weapons are banned, i'm not sure why. however, the argument that 'poor people' don't have them and will have less incentive to battle makes little sense. First of all, diamond tools and armor are not prohibitively expensive. with the end exp farm, it's almost a joke to enchant them compared to before. secondly, most players already do have these tools, active players like smjjames, yqt, bla, me, etc all have the diamond items and enchantmnets, so it's not a hindrance.
enderpearls are banned because they let you get up close, but i think that banning them is the wrong way to handle the problem. why not instead surround the flag by moats of laval to make enderpearls a bad idea? what about strategically placed glass walls? I'm quite sure enderpearls can be easily defended against.
i'm not sure why potions are banned, but if it's for the same reason as diamond tools, then the same argument applies
unless you're worried that the tnt will kill the server, i have no idea why you'd want to limit tnt. do we limit the amount of sword strokes?