I don’t quite understand why this isn’t mandatory (or at least optional!) The game is roughly 5GB in size, I believe. That means it would take roughly five minutes to install to the PS3s HDD (10 minutes most)
There are no disadvantages for this what so ever! The texture pop-in would be greatly decreased and the load times would also be decreased. I know that X360 has this feature and it’s likely that the only reason that is because of the included feature of the X360 that allows players to install any game of their choice to the HDD. On the PS3 it’s a bit different. It’s the developers choice to allow players to install their game to the HDD. I believe it would help out the game immensely, especially in resolving the pesky texture pop-in issue. So… get it done SD! 
oh, and /signed, tehehehe