Not gonna lie....I thought "Dev in thread?" as I misunderstood your first sentence where you said you were sharing ideas the Dev has said about...so uh yeah I

messed for a while there.
Anyway ideas 1 and 2 just straight up yes.
Ideas 3 and 4 can be dangerous from what I've seen and experienced if it's done via environmental story telling rather than an dialogue or something to confirm it, because a lot of Devs generally give the human race more intelligence than it's worth and should treat us as if we're dumb...which goes double then for H-games. An recent example of this is well Crime Scene Cleaner that I've 100% recently and has a lot of environmental story telling with minimal dialogue really to explain or re-confirm the story telling, especially for the "Friendly Fire" mission where I spent fully focusing on the hints given and I feel like I'm still missing half the picture since I don't know why
the misunderstanding occurred. So yes good idea and would like because needs to be done right and with the expectation of us being
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Ideas 5 and 6 just yes so much so yes and I thought that Lutellaria was going to have when I spotted the fake cleaner. The both cases of idea 5 are great and honestly are extremely underused as being an way of giving player a choice. As the second case can happen if you call on the NPC's BS and screw them over before they do it to you so you have an straight up fight rather than falling into case one where it's maybe an much harder fight. (But it's also good to have the easier fight be the first case if it's again requiring us to not be
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again) Idea 6 btw could become even better too if you end up with two hidden H-scenes that occur with NPCs that run and hide because you could have the classic stuck in an locker sex while trying to be quiet as the monsters hunt for you. Reason for two is it changes depending on if you or the NPC are first into the hiding spot, e.g they slowly back up into the hiding spot and insert your dick into them or you do so.
But yeah overall good ideas all that I would like to see but just idea 3 and 4 can be dangerous to do if they believe we are too smart. To give my own two ideas, choices/decisions that actually impact the story and the protagonist via status effect or something basically swap sides and becomes an monster, there's so many games where they say choices affect the story but nope you still get bad or good ending with no variations to them and there's games also that show NPC's that go from normal to being an zombie and then attacking other NPC's or Hypno'ed into attacking the protagonist but none have the protagonist be the one doing so. (Villain protagonist games are super rare I feel, those I've found are simplified/bad like Heavenly Heroes of Antidomi,
Virgin Invader is an good one though)