Sooner or later, Gamdom will add more cryptos to their site, especially if many members suggest the same. Of course, that will make us happy because we can choose the coin that we love and the best is to reduce the fee if we want to withdraw. Meanwhile, we can be satisfied that they already have LTC, which is lower than BTC for the fee. So we can use LTC if we want it.
Hopefully, Gamdom can add an exchange to their site to convert from one coin to other coins and send the coin that has low fees.
They can add more Coins they can easily do that but adding internal exchange is not necessary they are a casino and not an exchange that's an additional configuration of the script, top casinos did not add this feature because this is the least important, I'm hoping that they'll add Doge Tron and if possible other top coins and tokens in the market.