I was wondering if it may be possible to add a "Employee" argument or a Owner to the /buildmode or /group buildmode. This way if someone want's to hire another player to build something for them, they can enter the command to give all rights of the blocks placed to the group leader or specific player. When the hired player leaves the group or disables /buildmode they loose all rights to break the blocks. Not sure if this is possible or not but figured it would be worth suggesting.
/vouch gives people permission to break your blocks, while the idea behind this suggestion is to allow others to place blocks for you and then after leaving the group or disabling the command will no longer have the ability to break the blocks because the ownership of the blocks is changed to the group leader or the specified player.
Check out this previous thread . . . https://empireminecraft.com/threads/block-placement-under-another-username.76540/#post-1433047 (This link will take you to my post) Essentially, if a block is placed in a Claim, the Claim owns it. Admin rights pass to the owner of the Claim. Ownership of a Claim can already be transferred to another. So, a person placing a block in a Claim will lose the ability to break it . . . Maybe after a period of time, or after the owner executes a "claim" command or something like that. -BZ-