Sort:  

Simple integration. Commands such as /deposit -- returns address, /send -address- -amt-, so it can be used like a CLI wallet -- at least for a start ;) Could go as far as some kind of built-in marketplace to trade in-game goods for coins :P and if you build it right, you could market it to all cryptos as they mostly (maybe not steemit) use the same type of json RPC interface

Let's have a talk on discord as @reggaemuffin mentioned, will be easier to sort things out and to share ideas.