I would add ETH. I do not personally have any LTC at the moment, but it also a good option. There is also a new coin/token being engineered just for online gambling, but it is mostly geared towards traditional online casinos and poker rooms, not so much the bitcoin only variety.
We are in the process of looking to add more coins to be used on CoinRoyale.
You should add more coins as soon as possible, almost all casinos are accepting alts already. As I can say, coinroyale is the only old gambling site with less improvements than other casinos. Other casinos are competing to give their best to their players by upgrading and updating many things regularly, but I cant see it on your site vitcor? Any reasons why?
Also, I don't see him running more promotions to attract more people to the site. Maybe he is busy with other things or he may be having a some fixed players on this site so not much worried to attract more people. If any casino run with the only bitcoin these days they will not get much traffic to their site particularly all small players will not go to their site.
