I have a Razer BW Chroma Stealth and although noisy, it's not generating commands as I don't normally have my mic cranked up (plus I have a noise-cancelling headset... not sure if that's what keeps out the sound). You can see what types of commands your keyboard is, 'generating' and add those with an the, 'ignore' action. Might help some.
As far as key sensitivity, VA has no knowledge other than, 'hey, a key was pressed'. Synapse may have a setting that works with games, so that's totally out of VA's control. Maybe look at the gaming mode of Synapse and see if there's something in there that can be adjusted (if you find something interesting, let us know).