Yep! This. I think the entire Diplo screen should just be a lot bigger, to give more room for usability. Use nice big easy-to-see check marks or Xs. The Tribute buttons should be bigger and accrue the amount for each click, then there should be buttons at the bottom of the screen that say "Accept" and "Cancel", replacing "Close." The changes to diplomacy and the tributes made should not enact until "Accept" has been clicked.