According to @hloo on a governance town-hall, @amiller proposed a miner signaling mechanism that is a kind of gauge mechanism: each recipient has a max of some percentage, then miners can either choose to pay up to that amount or less. This establishes some kind of permissionless gauge and it doesn’t have the 0-sum competition problem. It’s no direct financial benefit to a miner to pay less than the maximum, so hopefully they’d use their discretion wisely.