We have also thought about doing Royal Flush and 4 of a Kind bonuses on the ring games. Would anyone else be interested in this and would it encourage you to play more on the ring games? If so we can possibly get this implemented.
Yes to that. It could be just enough incentive to get all those freeroll abusers to play RGs and buy-in tourneys.
Other thing to consider are loyalty points, earned by playing raked games and based on rake contribution (to avoid abuse). You could then just reward player with most points earned (weekly?) or let exchange points for chips etc.
And if it's not too hard to implement, I'd like to see referral program. There's no harm in having that. If I have some spare chips I could do some small affiliate giveaway.