I am requesting this as I have a print going on at the moment with multiple parts and one part is failing about 4h into an 8h print, it would be good if I could select a part in the print preview and hit a button to cancel that part of the print and still have the rest finalised so I don't waste time having to re print the rest and only scrap the plastic from the failed part.
Maybe Simplify 3D could come out with their own fork of Marlin with some nifty integrations like being able to omit certain areas of the bed if a problem arises.
If they came out with their own fork of Marlin, making a custom Gcode parser and interpreter would open up a huge world of possibilities.