The main example where I have wished for this pretty strongly is the "missing permissions" PA. This is the one that warns "not all permissions are included in the deployment". It would be useful to be able to go from that PA to a view where one could either add all the missing permissions in one go, or do so selectively by profile or permission set. Right now one has to screen scrape the output, paste it into a text file, go back into the comparison and laboriously hunt through the comparison to find the missing nodes, then add them.