You have many very good suggestions, and in all honesty, it's a bit hard to keep. We do evaluate each request to determine how to best proceed based on current development priorities and backlogs, and it's not feasible or even desirable to address every request.
The intent with New Formula Column is to provide easy access to the most commonly used functions. As you can imagine, the list can quickly grow, making it harder to use this feature as intended. While we've marked this as Not Planned for Now, it is still on our list and we will revisit if there are other requests.
Thank you for your contributions to helping make JMP better,