Now, here is the basic idea on how it should be implemented:
I'll give you the same answer I gave Thirdspace:
if I'm not mistaken, early primedice also change seed on every roll but not anymore
now afaik primedice and just-dice only change server seed on (player) demand
To be honest I think there might be good reasons that the other sites haven't changed but I'm not really an expert in that field. It could be more about a matter of opinion as to which system is fairer. If you're concerned I'd suggest PMing wetsuit and having a chat about it. I know he hasn't logged on to the forum for a while, he's been away but should be back very soon. I think me getting in the middle of the debate would probably only confuse things.
I know he's going to start work on the rebrand soon which involves recoding the whole site from the ground up. That probably makes it a good time to discuss this. I have no idea why you feel the need to hide your identity but I really don't think you need to. We've got problem discussing suggested improvements.