Hi Olly!!
1. ) I think this has something to do with your computer's drivers / software or hardware. Most players do not encounter this problem as you described. It WAS an issue before because of the lighting plugin but it's fixed now. If it helps, maybe you can try making a new save file?
2.) Are you using an old save file? I replaced the auto save plugin in 0.7. It should auto save only every morning when you wake up.
3.) Persona is a huge influence to me so yaaay!
4.) I'll keep your suggestions in mind. I can't promise to implement them yet, but I am thinking of game events involving the Houses. Glad you're enjoying the demo!