Please allow for a narrower field of view setting to be as low as 50 degrees. I highly prefer settings like 60 or even 50 degrees, the size of objects and "people" on the screen is much more immersive, tracking distant targets is easier. I also tend to suffer from a bit of motion sickness with too high FOV settings. Plus: it can be slightly beneficial for performance.
YES, you may argue that insurgency is a tactical shooter and players will need a good periphal sight for situational awareness.
But it's always a fair tradeoff, you exchange strategical periphal sight / situational awareness with better long range target aquisition.
You may add a warning that you don't recommend settings below 70 for tactical reasons. But it's all about freedom of choice and personal preference and it should be possible.