That is a very good list. 
If you search in this forum up will see some detailed responses to these same requests.
- Not possible (search garmin in this forum and you will see detailed responses)
- Also a request. I suggest you search and vote for it
- This might be a request but that seems worth creating a new request for. I agree with this
- Yes - I want to do this, ideally soon
- Yes - Delete is coming soon, hopefully history won’t be too long. Don’t plan on doing edit right now.
- I am avoiding adding anything that does not seem critical for improving training but you can add this as a request. I am considering in the future a new speed based and slope based training screen.
- I think you mean spin-down. Yes I think this is a request. I would like to do this but it won’t probably be very soon unless I get a lot of requests
- This is very interesting. I have a conversation about this and would love you to add your ideas thoughts. TrainerDay outdoor app?
- I think their is a request for this. It does seem nice but we don’t have much room, maybe when you tap on the chart (zoom) it tempoarily displays it for example. If you want to search or create a request for this it would be ideal.