1) Allow players to 'flag' a particular loadout and have that loadout be the one displayed at the main menu. As cool as the hero classes are, I'd much rather be able to pick my favorite veteran to be displayed on the pedestal.

2) Allow players to edit hero classes for cosmetic items only. Example: The Damned Legionnaire has a standard bolter, but I would like to have the option of displaying my adamantium bolter.

3) LSM Apothecaries have a blue light on their backpack. It would be cool if the height of that light reflected the amount of Narthecium the apothecary has remaining. This would also let teammates know, in the unlikely event that the apothecary runs out of Narthecium, that he is unable to heal them via injection. Painboyz should be given a similar feature.

4) Players in a downed state should see a message at the top of their screen indicating the vicinity of medics.

4a) "Standby! Apothercary detected X meters away." -LSM

4b) "An allied Warlock is X meters away." -Eldar

4c) "Hey git! Da Painboy'z about X meterz frum ya." -Ork

4d) A sorcerer has sensed your distress from X meters away." -CSM

5) When changing weapons that have identical stats (e.g., Shoota to Venerable Shoota), equipped mods should remain in place. A workaround might be installing an additional modslot in weapons where skins go. For example, remove the Bolter(Alt), Adamantium Bolter, and Venerable Bolter from the weapon inventory and instead recreate them as skins for the standard bolter in a separate modslot.

6) Please fix the respawn timer so that it actually shows the amount of seconds left until respawn and not simply displaying a loading wheel until that undisplayed amount of time has passed. It is frustrating to expect a 3 second respawn and not know that the actual time is closer to 20 because of a UI glitch.

7) For Conquest game modes, display a secondary timer that counts down to attacker victory based on the amount of Spawn Points they hold.

7a) Alternatively, the progress bar should be replaced/supplemented with a counter. For example, the attackers need 300 points to win and each Spawn Point on the world map grants one point per second or one point per two seconds.

8) Fortress defenders should not be allowed to destroy their own walls to move reinforcements back to the final capture point.

That's all I can think of for now. Let me know what you think in the comments below!

EDIT:

9) Allow players to queue for battles within the garrison, even if it is just a clientside garrison. I like being able to mess around while waiting for a match. This feature would particularly benefit large guilds as it would give them time to spar before a match.