This mod is amazing, thank you so much! 
I am new to the forum, so if I am posting in the wrong place, please tell me... So, I just played through a scene in Sector 7 slums where you try to leave (right after the promise scene), and Johnny and two other people stop you. Johnny asks (about Tifa):
"Just what are you to her, anyway?"
"Fess up!"
And you get to choose between:
- "We're just childhood friends."
- "Mind your own business."
Using Black Chocobo I saw that the second choice added 5 affection points to Tifa.
So my question is: Are there more scenes that change affection points in this mod? How do I find them? 
I never made a list for that sort of thing. Let's do that now.
BIG LIST OF LOVE POINT AFFECTING CHOICES NEW TO SACOn the train:Jessie
“Hey, thanks for saving me back there at the reactor.”
Cloud
“Oh…”
- Don't mention it. (-3 Tifa) [The player hasn't even met her yet lmao]
- Not lookin' for thanks. (Nothing)
Sector 7:Outside bar:Cloud
“Huh?”
- How could you say that!? (+5 Tifa) [Same as normal game but this is on a different map]
- …Sorry. (Nothing)
Johnny
“My sweet little Tifa… Just what are you to her, anyway? Fess up!”
- We're just childhood friends. (Nothing)
- Mind your own business. (+5 Tifa)
Inside Seventh Heaven:Tifa
“But you’ll help us fight them, won’t you Cloud?”
- A promise is a promise. (Nothing)
- Barret isn't worth it. (-2 Barret) [Interaction can be repeated three times for a total loss of six. Doesn't matter though in SAC because Barret starts with zero points and you can only see this scene if he's still at zero [[i.e. didn't give Marlene the flower]]]
Outside Honeybee Inn:(These are pretty brutal if you do them all. Good way to not date Aerith if you want someone else lol. There's also a scene inside the Inn that changes if she's lower than 45.)
Aerith
“Cloud… You CAN'T be serious.”
- I can check this place on my own. (-5 Aerith)
- Tifa's in here. I'm sure of it. (Nothing)
Aerith
“That was fast! How'd it go? Get lucky?”
- You could say that. (-5 Aerith)
- Tifa wasn't inside. (Nothing)
Aerith
“Wow, you smell great, Cloud! How'd it go?”
- It was fun. (Proceed to next choice)
- Don't worry about it. (-5 Aerith)
Aerith
“More fun than being with me?”
- A little. (-5 Aerith)
- Sorry… (Nothing)
Aerith
“Oh!… Finished already?”
- Yep. (Nothing)
- Not yet… (-5 Aerith)
Honeybee Inn Guest Lounge:(This has to do with getting the "Dubious Panties" key item. To get this you need to use the member's card to get upstairs, and then not get any key items up there, which you can do by picking the top left door and not talking to the Honeygirl after Cloud gets out of the bed. After that, go to the guest lounge and talk to the guy on the couch on the right side of the room)
Guy lounging on couch
“Don't let it get to you. Here, I got somethin' that'll cheer you up.”
- Not interested. (Nothing)
- Let's see what you've got. (+5 Tifa)
Shinra Building Elevator:Tifa
“Aerith… She sure has been through a lot.”
- Yeah. (+5 Aerith)
- So have you. (+5 Tifa)
Big bridge leading to North Corel:- Not a choice, but if you have Yuffie with you the scene that plays out with her gains her +1 point.
Cloud
“Don't worry.”
- I'd catch you. (+1 Tifa)
- It'd take more than a fall to kill you. (-1 Tifa)
Cloud
“Don't worry.”
- I'd catch you. (+1 Aerith)
- It's nothing compared to being around me. (-1 Aerith)
Path to Gongaga:(To see this, you need to have Barret in your party on your first visit, see the scene where Cloud looks up at the reactor, and hear a story from at least one villager.)
{BARRET}
“…Hey, {CLOUD}. You're gonna keep fightin' with us, ain't ya? We need you, man.”
- Count on it. (+3 Barret)
- Not interested. (-8 Barret) [Biggest single point drop in the game, and deserved]
(also, not a point gain or loss, but the scenes with Aerith and Tifa after meeting Zack's parents have additional dialogue that is locked behind an impossibly high point total [110] in the vanilla game [barring the Shinra Building exploit for Tifa's]. In SAC the total was lowered to 70, which is easily possible.)
That's all I remember right now but there could be more.