Originally Posted by guyod
If im Think of the right Square D they make a double breaker with 2 15 amps switches that fits in one slot. (each wire has its own switch and amps )Then you would have nothing to worry about. Like not having enough wire to move circuits to other breakers.
This works ONLY IF your panel accepts this type of breaker. Not all do.
If it's two VERY light loads, then pigtailing or (legally) doubling up is fine.