Things like this are what differentiate TWI from typical developers who ignore playerbase input and disregard easily-fixable gameplay problems.
I had a difficult time choosing a single option;, as I felt these three took nearly-equal priority over everything else:
Realism Mode: More changes to game play in this mode (sway/speed/fatigue, ie: More realistic)
Changed/Improved Features: Bleeding, bandaging
Realism Mode: No unlocks/upgrades
Changed/Improved Features: Improved squad system (interface, functionality)
In the end, I voted for "more changes to game play in this mode". I think relating idle sway to stamina-left is a vital gameplay mechanic that a game like RO2 needs, but I am also one of the few who have no problem with the idle sway, recoil, and running speeds when stamina are full.
Nearly as urgent is the bleeding & bandaging system. As it is, everytime someone begins to bleed, they immediately stop (and wherever they may happen to be, even if it is a wide open field) and patch up because the bleed-out time is so quick that they have no chance of surviving if they try to find cover first. In addition, the time it takes to bandage is ridiculously short and not at all appropriate for a tactical FPS like RO2.
After that, I feel the complete removal of the weapon proficiency system is in order. Giving experienced players artificial boosts to their recoil-absorption and reload-speeds only makes the game more difficult for newcomers to RO2, and does nothing to enhance the gameplay. While I think the game would still be alright if unlocks remained, I think it would be vastly better if rare weapons like the MKb-42, AVT-40, G41(W), MP40/II, SVT-40 Scoped, or rare attachments like the saddle drum for the MG34, and so forth, were randomly distributed per round rather than through a progression system. These things absolutely will not stay rare if they are acquired through a progression system, and they will ruin the meta-game by making them completely abundant.
I also think that players would actually work in squads if they could easily see who was in their squad and what the squad objectives were. A good start would be to entirely replace the class selection screen with the squad selection screen.