Activate-able killer perks?

I had an idea for a killer perk (or possibly ability but it seems far too weak to be an ability) the other day that gave me the idea for possible activate-able killer perks similar to how they function on survivors. My perk idea was one where the killer can use it once they’ve hooked maybe 3 survivors they get a token, using it burns the token. When activated, the killers terror radius does not move with the killer for 5/10/15 seconds and allows the killer to move silently for the duration. But after the effect the killers terror radius is increased by 5/4/3 meters for 3 seconds. Some people find the lack of terror radius iffy but it’s been done in perks before like tinkerer, so I don’t think it would be too powerful at all. Let me know what you think and if you have any ideas for possible activate-able killer perks also, I think it could be a very interesting idea.