For what it is worth, the context menu is the main element in the game that frustrates me. All the points raised in dslyecxi's video are relevant.
We live in a golden age of amazing GUI and usability, and then there is Arma. I left Arma2 because it was clunky and the context menu poor, and though the game is much improved, the context menu is still feeling like an afterthought.
Como-rose, used them several times, not a great fan they take up too much space, attention and screen real-estate; if i'm in a heli I don't think a rose is going to be of much use.
The segregated context menus: user actions / world actions - much better idea, context menu stays the same or similar for anything on the character ie. touch of bombs, treat self etc...
use menu (tap): open door, get in vehicle (the side/part you are looking at), light fire whatever... one touch does the job, no spamming spacebar.
use menu (hold): world interaction context menu as mentioned above numerous times.