Out of Office Delegation

When a resource goes out of the office, weather it is 1 day or 6 months, sometimes timelines cannot shift, so someone else needs to complete out tasks, issues, requests, proofs, etc.... We would like to have an option in the profile setting for each resource that they could place in an OOO and who is covering for a specific date range. The OOO would then delegate all tasks, issues, requests, etc... to the person outlined in the OOO. The resource delegated would be able to finish items on behalf of the person out. When the person would return they would turn the OOO off and everything would revert back to the true owner.