I guess I finally understand what you mean, as I came across a casino software suit with a brochure saying:
And the answer is no, my system has no such rig, the algorithms on both free and real play are exactly the same (I'd already see some folks losing the 100 Free chips quite fast... maybe I should implement a rig like that one of that casino software, but I really don't like rigged games, so to this one also the answer is: No I won't.)
Still I was thinking of your question that because you were winning on Free Play mode, you would still win at Real Play. That one I can't tell... you could be winning at free and lose at real / lose at free and win at real / win on both / lose on both... I don't know, don't have a "make lose"/"make win" switch.