I am kinda torn either way.
I know that if I had a 20mm hub cannon I would get wayyyy more kils. But on the other hand half of the mystique and challenge of flying the k4 is the gun package. That one reason is why most people give it up as a regular ride.
30mm are just wonderful snap shot rounds. Nothing beats it. The down side and what I like about it is its very hard to construct gun solutions. It requires the pilot to fly much differently as compared to normal turny planes.
I am with you on the guns as far as "funness" (not a real word).
I have a suspicion that if the k4 had 20mm guns it would be like the la7, spit16. 4-hog, or typh.
The k4 is the best kept secret of the game
