This idea will affect high sec the most, only because of how crime watch is handled in all other sections of new eden.
It would also require changing how loot drops are determined, highest damage would get the loot if no contesting occurs.
So the idea in short, if two players attack the same target (more details on what constitutes a target later) and deal within 20% damage of each other a popup comes up asking to contest the loot, if both players agree to contesting the loot, a duel between the players and access to the loot is removed from both players until one of the ships is destroyed.
If only one players contests the loot and the other player declines the loot goes to whoever was willing to contest it.
If both players decline contesting the loot, then the loot follows normal rules for loot drops.
As a fail safe should someone contest loot and leave the loot would turn to a normal wreck based on how the other player left; If the player is DC the wreck returns to a normal state after 5 minutes, if the players warps off and is more than 3 systems away they are deemed to have forfeit the fight and the loot will go to the remaining player.
A contestable target is one that carries one of the following.
Faction module, dead space module, officer module, any kind BPC, implant. (I’m sure there are more types that I cant think of off the top of my head)
If there are more than 2 players who participate in the killing of a target then the same rules would still apply but checking for all players who dealt within 20% damage to the target.
EX: 3 players, one who does 20% damage another who deals 30% damage and the last does 50% damage, the 30% and the 50% damage players would get the chance to fight over the loot, while the 20% would be left out.
EX2: 4 players, one players does 70% damage and the other 3 only do 10% damage normal drop rules would apply.