I have a fairly simple question, how level dependent are intimidation and wasteland whisperer? By that I mean, can a lower level character actually use those abilities on a higher level npc/monster? The reason why, is I am tempted to use a mod that increases the zone levels, which control what level npcs spawn in the area.

It would be annoying though if those perks depended on lower level critters, because I'd seldom be in a position where I am a higher level. And the reason why this is in the modding forum, because this situation would only happen when using mods to greatly increase the zone level.