The ability to add a filament change to MORE than one instance, without having to know how to edit Gcode and using strings in the post-processing section, there is no where that it is explained in layman's terms just how the post-processing section works and with what commands and examples, like {REPACE "; layer 5," "M600\n; layer 5,"}.
Also, you have to remove the post-processing command for prints where you need no filament change, It is just too convoluted as it stands.