The hints are for quests you are currently doing, (I assume you mean Luna's) luna's event is the start of another quest so the hint system tells you nothing because you haven't started it.I did follow the current phone hints, yes, but I didn't even get Lil's event cause I didn't know about it (it's not in the hints on the phone)
If you intend on making the optional quests secret, than CMA's hint system won't really work for you, since that one basically shows you everything you can do, there's no truly hidden events in there.
As for your comment on ren'py keeping the seed when you save, nope. That's why a lot of games that have gambling in them (and doesn't block your ability to save) can easily be save scummed.
I have yet to check CMA out but I do intend for the quest to be found naturaly while you do the other quests, that way it won'y overwhelm the player if I just drop 10 quests on them at the start.
Ya I guess I just found out about that, it's not really something I intend to fix if people want to save scum they are welcome to, I just wanted for people to have the same experience when they use rollback as it's expected, hell I will probably add cheats in the game at some point for those that don't want to follow the game the 'normal way'.