Our impressions from Tokyo Game Show were that Metal Gear Solid: Peace Walker is pretty great.
"The 30 minutes I spent playing Metal Gear Solid: Peace Walker on the first day of the Tokyo Game Show left me with the best first impression I've ever had of a game on the PlayStation Portable," wrote Kotaku's Stephen Totilo.
That's not good enough for Kojima Productions, it seems, as the studio is currently tweaking the game's controls based on the opinions at TGS of the media, the industry, players, the internet, bulletin boards, etc. It really sounds like Kojima Productions is open to whatever input can make the title better and is making changes "at a quick pace".
At TGS, two control types were playable: Shooting Type and Action Type. Kojima Productions is currently investigating whether or not it is possible to implement a third control scheme into the game.