Bumping this old thread because I would love to see this feature. I often have to change speeds and want certain speed settings to be proportional to the main "print speed" setting, via a formula. I end up tediously changing every speed manually. It would be awesome to be able to write it with a basic formula. For example, for infill speed you can put "=1.2x"Print Speed"" or something like that. You can just leave infill speed like that indefinitely so every time you change print speed, the infill speed automatically changes as well.
Is there any chance we will see a feature like this soon?