DocGoblin, I found some interesting information while looking through gamefaqs on Snake Eater 3D. TBH, I was waiting for another post in that thread, but I'll share it with you first.
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-"I'm playing MGS for the first time!" prevents you from choosing Extreme Difficulty and gives you Mummy Camo.
-"I like MGS1!" gives you AUSCAM Camo.
-"I like MGS2!" alters the opening cutscene so Snake is wearing the Mask, adds an extra opening cutscene of Snake taking off the Mask, adds an extra radio conversation with Zero and gives you Desert Tiger Camo.
-"I like MGS3!" gives you Flecktarn Camo, Green, and Brown facepaint.
-"I like MGS4!" gives you DPM Camo.
-"I like MGS PEACE WALKER!" gives you Banana Camo.
-"I like all the MGS games!" gives you Grenade Camo.
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Also, I heard that instead of the GA KO camo (which made you detect Kerotans) you have a fruit camo that detects Yoshi. I have yet to confirm it, but I already got to Snake Eater, so I'll probably get to it.