I will say, if there was one thing I would ever want to see that would make the game an easy 5 stars, it would be the ability to actually directly change the probability of certain clients showing up, positively or negatively. As it stands, its absurdly difficult to actually get certain clients over others, especially the newer ones.
The new gyaru couple, for instance. I have gone through roughly 30 in game days, with every few days changing which maid I set out front. I have seen the new clients once. In contrast, I have seen the average guy, the new couple (not the shy one), the jock, the sports guys, and the rapping punks more times than I can count. Its absurd.
I know certain events say in the text that a certain client will "come less often" or "come more often", but it often has little to no actual impact on their spawn rate.
Could be a cheat, could be a direct "stop this client from spawning" or "increase the probability of this client spawning" button, I don't know.