@whitby I like the idea of having to build up to your top speed.
Whenever someone brings up "skill-based gameplay" I always roll my eyes a bit because it's usually in justification of being able to use a bolt-action as a CQB weapon as they stand their ground and flick shoot someone who got the drop on them, and other such nonsense you might see in the BF or COD games. No, I don't want "skill-based" gameplay if it discourages tactical gameplay.
Adding a bit of weapon sway after running as you catch your breath is realistic, and really only affects more distant targets which should be less of a threat anyway. The games I've played zip by really fast as the teams head-on blitz eachother, and I guess I'd like to see something a bit more cautious - though the weight system could really come into play here - someone with no armor/no vest, just an SMG and a handful of mags shoved in their pocket could still be fresh as a daisy after a mad dash to an objective, whereas a guy with heavy armor or a rucksack full of AK drums would be sucking wind, and needs some time to steady himself.
Smoke REALLY obscures your vision, real smoke grenades don't really choke you, so it's just an added game play benefit, and is good enough as it is.