Hi,
1) sleeping salts are there to drastically lower the awake meter, that's it, they only lower it by some fixed amount, but if you continue to fuck her the meter will still go up.
2) green tea lowers slightly the rate at which the meter fills up, it's not a hard sedative that will knock her out for you to have fun with almost a carcass.
3) to use her mouth, it's best to give her numbing lip balm and green tea and also suspicious body lotion, as well as having all dex upgrades bought. That way you will ensure you can use her mouth as you please and even fill it up.
Regarding the actual sex, no matter what you give her, or how skilled you are, if she's dry as plywood, it's gonna hurt - simply make her cum first with fingers(2)/mouth(3) and then use your dick.
4) her legs close randomly, you just have to raise them if they drop, "third-hand" is just a perk name, it doesn't give Nita more hands.
5} buss pass
So running currently have 3 locations: city, beach and countryside
You start your run in city, after approx 30 stops, you should reach the beach, then after approx another 40 stops you should reach countryside.
Each new location can be accessed as a starting point using mentioned buss pass, so if you use it to start on the beach, you could only reach countryside as the next location.
As for events, yes they are randomized, but tych are exclusive to that location, so in city you can encounter "bum", "corrupt Police" and "mad scientist", whereas on the beach there are "deep sea diver", "buff bro" and "sexy psycho"
They are in fact somewhat similar to the first three, they also drop glass/metal/plastic as well as cum gum, body lotion and lip balm, but are harder to defeat, give more XP
You also gain more stamina while running on the beach.
6) thanks for reporting more bugs
7) cum gum - during the night you gain arousal while using you dick (that drop like icon) when it's full - you cum, now after the first shot, the rate at which it fills up slows down a little - cum gum fixes that so that it fills up faster
Hope this answers all your questions, if you have some more feel free to ask, of join our Discord server, so you'll be up to date with devlogs, you can see what the dev is currently working on (he's posting daily devlogs revealing progress and some visuals that will be in the game), you can file out a bug report, ask for a potential feature, post a comment that will be included in the game, and get help from other people!
Cheers