Talking about toyota racing, before that can be implemented the vehicle physics need to be polished - side scrapes against objects shouldn't bounce the car to an instant stop, nor should collisions at very blunt angles.
Also I wanna drift the thing so badly, might actually help with those tight corners ;-;
I think the drum mag icons would look better using a pie chart/clock style representation of their ammo instead of the current vertical bar style. I posted this suggestion a while back but nothing became of it.
Reloadable rocket launchers currently have a bug where if you open the voice comm menu, it cancels the reload and swaps to your primary (same effect as if you just fired a rocket and clicked the left mouse button afterwards). It's quite frustrating to say the least, since this bug has existed since at least the second beta.
Bolt action rifles belonging to the enemy team also cannot be reloaded if you decide to pick one up and get ammo from a resupply crate - the reloading animation will play indefinitely, but the ammo counter never actually updates. This is most evident in co-op and can be frustrating if you want to use sniper rifles but someone else on your team is already a marksman.
Melee could use significant improvement - it shouldn't feel like I need to go to USMC sniper school just to smack someone in my damn face. A system like halo (minus the lunging) or even Left 4 Dead 2 would work great, in the former case being that an auto aim for melee could be used, or at the very least, an area of effect that is a cone but not too wide, much like a shotgun, and if someone within range of your melee attack is within the cone, damage will be dealt. In the latter game, melee weapons and shoving had swing arcs, with dedicated melee weapons having their own unique arc patterns. Perhaps weapon bashing could work a similar way in that weapon meleeing would create rays that would be dependent on the animation (e.g. muzzle strike versus smacking with the butt of the gun).
It's also nearly impossible to melee someone who is moving, even if you're still touching them all the way.
I think most of the magazine sizes are the way they are for balancing purposes - you spend 1 supply point on the extended mags which give you a bit more ammo BUT the reload time is closer to that of standard mags, or you can dunk 3 points into a drum mag which gives you significantly moar dakka at the cost of slower reloads.
If theater editing becomes possible however I would be quite delighted to use realistic mag counts.
I remember in the days of Ins Source, the devs said that the game isn't meant to be super ultra realistic, but rather a mix of fast paced arcade action with some milsim elements. A lot of these things you're asking for, barrel changes etc. are what other games like red orchestra 2 offer and would probably scare off more casual players, particularly if certain actions require lengthy key combos that would blur the difference between Sandstorm and Super Smash Bros. If Sandstorm were like other games there probably wouldn't be much point in buying this one.
If you have drum mags for your gun but you scavenge ammo off similar guns, when you reload those magazines they give you the correct amount of ammo for their mag type (e.g. extended mags will never give more than 35 rounds etc.) but the reloading anim will still use that of the drum mag, resulting in the player holding an invisible drum when loading an ordinary box mag.
If you try to pick up an M24, get ammo from a crate then try to reload it, it never actually reloads. If I recall correctly the shotguns used to have this bug but this has since been fixed, I haven't tried it for field-acquired Mosins however since I use the M24 over the Mosin.
This only seems to occur as Insurgents - if playing as Security, picking up a dead teammate's M24 can be reloaded as normal.
Seems like this occurs for bolt action guns belonging to the opposing team.
I think the drum mag icons would look better using a pie chart/clock style representation of their ammo instead of the current vertical bar style.
Edit: Also can the RPG and M3 MAAWS not be put away when you try to use the voice menu while reloading those weapons?