Really good idea, completely reasonable. 100% support.
Based on the discussion that has run over to the discord I would say keeping the current speedrun.com system is agreeable to everyone.
We just really need to make a list of what strats are considered multilogging.
If we could play on an instanced world, we would, but this is not an option available to us. I think we have gotten away with loose definitions of multilogging for a while, but we should now put hard definitions on things. It is not unreasonable for a speedrun to have a short list of banned strategies/skips.
The Dark Souls series for example, alongside its many other rules, bans all online interactivity in order to keep the run simple: ("Online play with other players in any way is completely banned. Playing in offline mode is preferred to also avoid Vagrants and messages from other players.")
I would propose breaking strategies into three categories: Completely Allowed Multilogging Allowed Multilogging (With Multilogging Tag) Banned Multilogging
From here we have better options for allowing the community decide what goes in which category. My personal recommendation would be:
Completely Allowed Multilogging: Opening doors on a alt account
Allowed Multilogging (With Multilogging Tag): Cooking on another player's fire Shield of arrav Stocking a shop with a alt
Banned Multilogging: Picking up another player's ashes Picking up another player's bones Body blocking a boss
(Being able to pick up another players bones/ashes honestly just seems like an oversight by Jagex in the ironman system)