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Cubesmith stickers will curve around the edges a tiny bit, but cutting them isn't necessary. I'm using them on my F-I right now. I asked Cubesmith's Chris Liccardi and he mentioned he would look into making different sized 3x3 stickers, so I'm keeping my fingers crossed. Maybe if more people asked him to he might look into it harder.
The stickers that come with the new Type A's (A5) are also smaller and will fit on the Type F's, if you happen to have some lying around. I don't know if those stickers are sold separately from the cube though.
I have the cubesmith stickers on my F-II and they do not peel. However, you could also take a razor and shave them off carefully after you have them on the cube.