SO, if you want to add 2 rounds? Go for it. I imagine stuff will get a bit hyperbolic in rounds 6 and 7, especially if you know what you're doing. But, honestly, it requires no work on your part. Just...make it 2 rounds longer. If you like that more? Sweet.
No, What are you mad? The world will explode if he plays the game 2 rounds longer!!!!