Is a 3 way switch required at the stairs to a basement with no other entryway? We were given a violation for not having a 3 way switch in a basement with no entryway.
Do what common sense would engage yourself to do.
Codes are written with safety in mind, but there are not capable of covering every single situation.
If it were my place, and there was the slightest chance where a extra light switch could prevent an injury, I would make certain there was another switch.
Falling down multiple stairs can be hazardous to your health. Especially in the DARK.