1) There won't be an official Discord because I have 0 desire to moderate one. But people are more than welcome to create communities for the game, and I'd be happy to link them on the page.
2) Coming in the next update! You'll be able to rewind, edit LLM output, and insert a prompt at any point in the conversation. Stay tuned!
3) Exporting a character as a SillyTavern card is a feature I'd love to implement in the future. There's currently no plans for content after the 1st semester, but it's not impossible. Maybe sometime in the far future
4) The next update adds fine-grained generation settings which will technically allow you to generate guys. I've already been able to make one on the new update, but unfortunately the body types are quite limited: since we use pose data generated from girls, you'll only get guys with pretty feminine proportions. This isn't something I plan on supporting too much, but it will at least be somewhat possible