Maybe with the question of when to add other options it will be resolved soon because the developer has planned in the future with this LTC coin, you can say good news and small capital gamblers don't have to worry anymore, you can bet freely.
With trading sites, I don't know yet, meaning the developer hasn't provided details here, which is clear that this feature will be useful later after the team finishes it.
Rollbit should be able to provide exchange to other coins so that it is easier for gamblers to change what they want in this case as it will be more interesting in my opinion.
I think you are misunderstanding about the exchange available on rollbit As far as I know the exchange in question does not mean that players can exchange their coins for other coins the trading features that will be available are another type of gambling