On Aug 11, John Hawkinson wrote:
| | Disklabel programs that try to be smart and prevent people from doing
| | dangerous things in my experience are a PITA.
| 
| Prevention is different from warning.
| A warning is perfectly reasonable, and should be implemented.
| (Code to do so is quite welcome).

i recently submitted PR#10777 with a diff to disklabel for this.
although it prevents you from being able to have overlapping
partitions, changing this to be a warning only is trivial.