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Yes, it is a great addition, I do not know if they have also thought about adding ADA, it is taking a lot of strength and playing with ADA feels very comfortable, of course BNB has excellent support, because Binance gives a lot of confidence, also if they have more cryptocurrencies in the casino, attracts fans of the same, ADA has many followers just like TRON.
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I am sure they are considering adding ADA, it's just a matter of time, but speaking about good addons, i would gladly see some L1 protocol coins with lower marketcap but good fundamentals. Like XLM, FLOW and NANO (there are many of them but those came just from a top of my head)