Community Wishlist Survey 2022/Adding the ability to use custom headers on average headers

Proposed by LifeWasGoodOnHotdogStand

Proposal summary: Extending the freedom of using custom headers

Full proposal: Adding the ability to use custom headers on average headers. Nothing the matter with that. Don't know why only WIS/WIR/RQ can have the custom headers but BQ/GQ can't. I'd really appreciate if it we implemented it in.