Nope, URM doesn't work on my game for some reason. Bricks the save feature on the sandbox and causes a big mess.A good way to test would be the URM tool that can be found on this site. Would give you a good way to manipulate variables on the fly and see how easy stuff breaks.
I know my code-base well, it would be a matter of making sure none of the cheats break the game irreversibly or in a bad way.
One little cheat that I'd love but would be tricky is being able to revert Lust Levels and go back up whenever you want for any character. Like Ms. Claire, who's gonna get to LVL 2 in 0.5.1, the cheat would let you revert her content to LVL 1 if you wanted. But it would definitely cause inconsistencies if another girls' scenes presume you already have Ms. Claire on LVL 2 and bring her out like that, I guess there's only so much I could control here.
On another note, cheats like manipulating Love, changing names, unlocking abilities and unlocking the gallery would be very simple (though, unlocking the gallery would be pretty bad for a first-time player since many little interactions check whether you've seen certain scenes or not).
There is a money cheat in the game already but it's super hidden. I'll keep it that way, since I'd like for cheats to be unlockable by buying them in the special menu.