Thanks a lot for your advices max!
As you probably know, Im not involved with the development of a poker dapp, but yesterday I was facing a similar problem concerning the math()random when I tried to upload as a dapp, one of the pre-alpha test of our GoldSeed project.
Maybe we can solve it following one of the choices youve written!
See ya!
How about mouse movement. like on truecrypt(or whatever it's new name is)? It is used as a randomization tool.