Description when hovering buttons

[Pharaoh2k]

Hi, Paul, this is brilliant!
This is a feature request, not an issue.
Can you please add a way to easily define the description to the buttons/payloads (built-in and self added payloads)?
Example:
https://kar0218.github.io/900N/index.html

Screenshot:

P.S. Ability to set specific payload colours as in the screenshot would be useful too, not critical tho. :)
Thank you