Wow, that's really clever approach. I didin't think of it. Thank you for the idea!
It will be a little tricky because it will depend on:
- variable stamina bar size
- variable max stamina value
- type of reosurce character is currently hitting (chopping and mining have independing levels)
- tier of current skill (stamina spending increases from tier to tier with damage)
However it would help player a lot with information, so I think it worth trying to implement. I added it to my trello. Thanks again!