Answer:
My own cat used to be feral before I made him an indoor pet. Now, I'm not exactly sure what you mean by your question, but I will try to explain some things.
Feral cats will not be very friendly toward humans if they aren't treated well or even in contact with humans at an early age. However, some feral cats might be friendly simply because their parents were.
If you want to make your cat an indoor cat, go slowly. Bring him in for short periods of time, but let him out when he wants to go. He might get used to or even like coming inside, but with some cats, they aren't willing to let the outdoors go, so don't force them.
While going through these stages, refrain from scaring them, even if they do something like scratching the furniture. If you hit the cat, they might not come back when you let them out. Plus, this behavior might be a result of anxiety from being kept inside, away from what they've always known.