F91 is my second favorite paper suit, next to V2B which is my first. F91 in itself is a mad swissknife- You got vulcans, beam pistol, and a KD beam which is everything a paper should be and need. I admit that I play F91 mostly on mode 1 and only go MePe when against a rushing rock. Even until then, I will not take out my Beam launcher in mode 2 until I am strafing someone from a distance. Playing F91 makes you feel like you're playing every suit attribute. It doesn't feel like a paper at all.
Vulcans - abuse it. Good for assisting in rushes or hitting someone from the back. Even when hitting from the front, the vulcans still hurt.
Beam Pistol - good for covering your team from a distance, although I prefer the beam launcher over this. More range could be a better tradeoff sometimes.
VSBR - KD when someone's rushing at you, or KD an enemy that's hitting your team. Good for stealing kills too
I don't really melee unless necessary. It is sometimes better to not melee at all with F91. It depends.