FOV is Field of View. It's basically how much you can see round about you, but as red said, SP has no fov limit unlike MP. MP movement is much better than Sp movement in my opinion, I think SP has a slower acceleration, your speed halves when you jump, and you tend to slide more, as in stopping is slower. Lua is a programming language, but JA++ and JKG support plugins made in lua. OJK doesn't support increased fov limit in MP or lua plugins.