Thank you very much for your patronage! :)
And yeah, making a new walkthrough has been on my radar for quite a long time actually (you could actually read a few mentions in my older patreon posts about it as well), but so far I've yet to figure out a good way to implement both walkthrough and cheats in the game. As for what happens in different combinations of trust/affinity, depends on the situation and character. Some characters care a lot about trust, some about affinity, some about neither and some about both. It also depends on the situation.
There are no rules about which stats are important either. Balancing has so far been a low priority, and will probably stay that way for a while still, but some skills have limited usage, while others will have more broader one, depending on the situation.
Yeah, I'll add a cheat that adds tons of stats to the character and affinity/trust points to all characters. I thought about how to implement it before, but now that I've read your reply I had an idea of how to do it simply and properly.