beep on temperature reached
It would be nice if there was an audio indicator of reaching temperature, probably configurable so one could differentiate which extruder or bed.
This was asked before in 2016. It still seems like a good idea, especially now I have a PanelDue. By default I want the heating to run without waiting, so I don't think the macro suggested in that thread will work.
Yes it is a total bell-and-whistle featurette, and many who prefer silence (usually including me) won't want it so it would need to be optional. Nonetheless I believe these little bits of polish really grow on people and make the system stand out.
I would also probably use this if it was available. Another thing to add to this is a secondary beep or alarm as a reminder that the heat is still on after a user set time or something.