How about...

[Nyah~]

A button that lets you take revenge to whoever' 'available'? Most of us have to rummage through piles of 'unavailable' potential revenge targets just to be able to attack one base after minutes, ten minutes of searching.

 

[WarrenX148]

Or just force revenge attacks to be available as long as you're not online. Revenge attacks should adhere to different criteria.