"we add another random value" .............. key words..... "WE ADD".
The full sentence that is written in our Rules page is :
"To ensure that we don't know in advance the outcome of the dice roll, we add another random value which is not in our control, and that is the transaction ID of your bet transfer, as it appears in the block chain."
You can consult with independent 3rd parties who understand in provably fairness and they will confirm to you that there is absolutely no way that we can influence the roll of the dice.
http://www.directbet.eu/Rules.cshtml#Dice
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