Thanks for the very good ideas, some had even crossed my mind, but I couldn't do it yet. In the case of Penny, I intend to put several different scenes and change according to the relationship with her, I haven't had time to do that yet.
As for Jane's panties, having taken them doesn't mean you kept them. In the scene where Brendon apologizes to Jane, if she asks him to throw away her panties, Brendon misses them. If she doesn't even talk about the panties, it's because Brendon never took the panties with him. This path is an easter egg, so it's supposed to be secret. But I owe you a way to let the player know if he has the panties or not.
These solutions or equivalents will come in the next updates, you can be sure. 😉