Thank you for your comments and questions!
1. This will be implemented in version 0.5.0. It is already available in the Patreon early access version.
2. There isn't one yet, but I think it's an interesting idea. I consider changing armor to be a kind of class change.
3. I would like to consider adding variations in the future. I would also like to add more events within dungeons.
4. I would like to add defeat events and combat variations based on the enemy's gender.