Thanks for the quick response.
1. We made the seeds changeable every 5 minutes because some users used scripts to change seeds every bet. So you can change your seeds once in 5 minutes.
Why would they do that? It won't increase their chances of winning. My guess is they are hoping to get a hash for which they already know the input. This way they will know the results in advance.
2. Sure, we can show hash of the next server seed. It doesn't matter to the casino. But if users will have more confidence from this, then we will do it.
Please do. In a proper pf implementation, the server seed must be generated before knowing the client seed. Showing the next hash is the only way for us to know it hasn't been generated after we entered the client seed.