Mayhaps. However, people can be frightened of you long before they catch wind of your mones. A lot can be said for a badass appearance.
I agree.Behaviour is verry important if not the most important thing when it comes to badass appearence, but I think that pheromones can make your appearence more real, more to be felt by people, like punch in the face.
In normal, daily usage no one needs such mix, but sometime one needs to be dreadful.For instance if u’re a parent and the neighbourhood kids’re messing with your child you might decide to have a little chat with them.In this case if u have a mass killer aura(pherosignature) and pretty badass behaviour theyll probably be so frighten that never mess with your boy/girl AGAIN.
Another case is when some neighbour is playing nasty with you.U can beet the shit out of him but u’ll probably end up in jail.But if u’re too fearsome to people u can just have a little talk with the neighbour jerk and settle thing without even touching him.The point here is that if you just act such behaviour it might work out or not.But if this is powered by pheromones that send signal of deep fear, the other person will not even think about if u’re or not really dangerous to him/her.Just assumes :"Oh, God, I’ll not mess with this guy again.I don’t want something to happen to me…"LOL
In some cases if the other guy is not so mentally stable it can be not so good to frighten him/her out ’ cause that may result in some attack from his/hers side, but in most cases it will work just fine.
Another good occasion in witch some dreadful pherosignature can be used is when you want someone out of your life.Old gf or bf who is literary chasing you can be frighten with lawsuit while sending the fearsome phero message.It will deffinately make the rejected person not to seek your company anymore. And…
Well there are many ocasions when you can benefit from such an unusual mix of fear (Instant Fear 
hehe).Just this mix has to be found…