Don't bother crouching, it'll only slow your movement and make it harder to adjust to a fast moving target. Ads is much more important than it used to be though. I usually pull Ads a split second before the burst, that way I'm not zoomed until the actual shot to keep the widest view of where my target is going.
English
-
Crouching increases stability so in some situations its perfect for staying of the radar.
-
Meh, after accumulating nearly 4,000 kills with fusions in PvP alone I can pretty confidently say that unless you're planning on being a camper and hoping for someone to pass your corner, crouching isn't going to make a difference significant enough to try making it a habit. Having more mobility and turning speed to follow someone is going to win you a lot more fights.