With this config enabled, if a player kills another player the killing player does not need to wait to be able to loot the grave.

Any other player would still need to wait as normal.

I believe there's already a feature like this in place. Either it's what you're asking for, or it's only allowing the killer to grab the grave. Can't remember how I've done it. Right now I don't have time to test and such, so let me know if you want me to change anything. Also let me know if this comment solved your issue, so I know if I should close the issue or not