I've managed to spam the orderbook by doing tiny increments in rate and have drowned out everything on the USD side of the order book using less than 1 USD in funds. Now nobody can see what's available. I'm sure i could do the same on the BTC side if i had any left and there was anything to drown, making the orderbook useless.
I think to solve it the order book should be put into bins, so it's more a rough idea of the quantity at each rate, by combining all the quantities at the rates say between 15 and 15.01, or you shouldn't allow quite such small increments in rate. Or maybe it should be left as it is. I suppose when there's active trade across the spread it won't be an issue because those micro orders will be picked up as soon as there's a trade. But I think there should be some way to see more of the orderbook if someone does do this and while you still have low activity on there.
Not really a bug but the way the order book doesn't update even when you place an order kind of bugs me
