Changing ownership of a work item in a WorkFlow Task

I'm making progress over here. Have nearly got a ticket management system configured for our company. In our case, I had to go in and carve out permissions for us from the original system structure (we are significantly simpler). To that end, I just about have everything working right with one problem. During various stages of the lifecycle, I would like to be able to assign tasks to other users or groups. These users or groups may not normally have permission to work on a work item during that phase of its lifecycle. E.g. I have a PR ticket that is being reviewed by the normally assigned group. That group delegates the workflow task to someone outside of that group. I would like that delegate to be able to edit the item despite the standard work flow permissions that says they cant. Is there some way to add a permission group that says "if this task is delegated to you, you have the ability to edit its linked item, despite your permissions in the linked item"