Eway has already been added to our list of requested gateways. Please understand a single gateway takes approx. 2 weeks to develop and that's just to get a working test plugin. That's 2 weeks of pure development time. We can't afford that consistently as we've to also support our user base by way of forums, hosting tickets, emails, etc... Meaning we can't possibly implement every gateway and until we've an API developers will be able to easily implement and understand nor can others. The latest gateway developed is currently CCBill. We will continue to monitor gateway requests and implement when possible.