That would be the same one behind a whole bunch of mods, ManlyMarco, and, as far as updating, he's at least keeping it compatible as other mods change and potentially start conflicting. Not sure if he will ever add more function to it.
Those are the orgasm positions, not the same thing, there are a whole bunch based on what action you are doing (not including the bunch of modded positions added). What I meant by positions not mattering is you don't unlock anything out of using a different position, you can literally go through an entire game on one position and it has the same effect as using every position in the game, no effect at all except how much you enjoy it. The same can be said of all Illusion games, actually. Even this one doesn't really have anything you get out of positions except enjoyment, what matters in this game is leveling up sex experience, which unlocks new positions and actions for later.
They don't interrupt you at everything, you can outrun them easily in both games and at least you get more chances to see specific interactions in the original because they can still interact if they run out of interaction points, they just can't do anything that they can't ask for themselves in the original and they can't even do things like ask for sex in this game without interaction points (I like to wait until they ask for sex to start their first time just in case they have lines mentioning it being their first like they do in the original, which has now taken over a week of real time to get about 23 of 28 girls to ask for it, them being able to ask for it without needing to be interacted with by me, which costs interaction points, would have reduced the time I spent trying to get them to ask for it for their first times by a very large percentage).
I don't even need to go to the city ruins in AI Shoujo, the game starts slow from the very first moment you get control. I wouldn't call it unplayable, but it is certainly an annoyance. That accessory mod bug, now that makes the game unplayable since NPCs freeze up until you restart the game.