Anti-tunneling incentive: Blue hooks (Need workshopping)
For context:
I'm a killer main, and obviously bias. I want it to be that killer has a legitimate reason to go around hooking each survivor, but not on that is so good people who been unhooked are invincible until the killer has hooked everyone else. The concept is based on an older, bad idea I had where if the killer hooks a person who has the fewest hooking states, the killer gains a basekit ten seconds of 10% reduced repair speed. If a survivor was killed by any means, the blue hook no longer works. There were issues with this idea, namely the fact that if you were tunneling, you'd still get the effects of the slowdown.
My new idea is that each time you hook one of the least hooked survivors, you gain a blue hook. Whenever you gain a blue hook, the blue hook effect triggers, which gives a small debuff to gen repair progress, starting at 0%, for 10 seconds. Each time you trigger the blue hook effect, it gains 2% value. So if you get 8 hooks and zero kills, you'll be rewarded with a 16% gen repair debuff for 10 seconds. It's not big enough that the killer will avoid hooking survivors that aren't the least hooked, but it's something where they will gain a reward for choosing the more "polite playstyle."
This won't solve the issue of tunneling, but this will make it so if the killer sees 2 survivors, 1 they recently hooked, and another they haven't, they have a reason aside from courtesy to go for the person they haven't hooked.