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The Coefficient is vertical monitor distance. It enables you to synchronise mouse distance to a specific part of the screen as FOV changes with scope zoom. 0% is effectively synchronising the speed of the game world turning at the centre pixel, 100% is matching mouse distance to the top of your screen, 50% would be halfway between your crosshair and the top of your screen etc etc. The game actually uses 100% coefficient even when you turn Uniform aiming off now anyway. If you find the options confusing you can just leave it at the defaults and stay out of the advanced menu. The way Battlefield comes setup by default for aiming sensitivity is pretty fool-proof. If you want to know more and fine tune your setup I suggest you first read Skidushe's excellent post to understand the concepts better.

Firstly, if you were to type 100 HFOV into the FOV field, then change from HFOV to VFOV for a given game, it will give you the correct VFOV value to input in game. You can see what type of FOV the game uses on the notes of the game. Hopefully this adresses your first point. IF and only if you use the same FOV for all games, the 360 distance (or any conversion method) should be the same for all the games, so there's not much to worry about there. For ADS it's unfortunately more complicated you have different conversion options, but I'd recommend 0% monitor distance matching. Setup the top section like this (with your own DPI): Then choose your game to convert to and choose it's own settings with the aim set to all and it should give you the values it needs without you having to do any multiplying. Please note though that it's not clear whether you're talking about 100 HFOV or 100HFOV(4:3) So be careful with that! Hope this helped