There are already mechanics in a few skills that reward players for being active vs AFK. For example, rockertunities in Mining reward you for paying attention. It's very similar to what you have suggested.
If there were to be an EoS, then it would have to be a complete rework IMO. Given the number of skills, it would require each skill to be looked at individually. Mining and Smithing have already received this treatment.
I'm looking forward to the day we see Woodcutting, Thieving, Agility, and Construction receives this treatment. There are already many threads on these topics, so I won't repeat those ideas here.
~A~
31-May-2023 18:12:26