Thanks for playing and thanks for your feedback - I'll address what I can here.
1) A skill to regain stamina is a good idea... ;)
2) Sorry about your hand. If there are specific interactions that are very annoying, please let me know via the bug report link. I'm terms of the overall grindiness of the game, I understand not everyone likes it but grindiness is the point, not an unfortunate side effect. I'm definitely willing to add or alter some quality of life improvements such as the clock time skip, but it's still going to be grindy.
3) This is also something I've been eliciting specific feedback on so I can try to make changes. I think I can add a forced time (that is, you can't immediately skip) to the training cap messages, I think that would help.
4) You can see what level the skill is (menu - items - skills), but I'm intentionally not showing you how close you are to the next level. I don't know how other RPGmaker games do things, my skill system is my own cobbled together mess. Again I know how I could share more detail, but at least for now I've chosen not to.