Actual solutions:
Spall Ricochets: This does not happen in game and it makes things like IS-3s annoying to fight especially with HESH as the entire load of spall goes directly toward the floor plate then ceases to exist. If some spall bounced back up it’d create much greater and more realistic levels of damage. (This may have performance impact but surely if the game can manage the extreme amount of shells that hit in naval, this would not be entirely unfeasable).
e.g
Spoiler
Lets test what happens when a HESH projectile over 72KG HEAVY (heavier than a man!) hits a T-44s angled plate!
Watch War Thunder 2024.04.16 - 16.20.30.04.DVR | Streamable
This is extremely easy to repeat in game, it happens with any vehicle with angled armour and makes things with very angled extremely hard to kill with HESH. Though of course spall ricochets would help for ALL ammunition, crampt spaces like T-34 turret would be less likely to a battle of killing one man again and again and again.
Hydraulic Traverse fires: A sizeable chunk of the ground vehicles in game would have flammable hydraulic fluid running through the traverse wheel, this is not modeled in game. It’s something modern tanks like CR2 and Leo 2 avoid by being all electric, and Abrams fixed mid life by replacing it with a less flammable fluid.
More consistent damage especially on gun mantlets: This is clearly a bug but I’m not able to get to the source of the problem, but gun mantlets especially noticable on Panther and 76mm Sherman will often be penetrated and do almost zero spalling after the fact. And of course there’s another thousand ways of being gaijined and having rounds inexplicably non pen that if you solved it’d make people very happy.
e.g
Spoiler
So I realise I’m diagnosing two different issues here but it’s definitly a problem where moving parts will cause no spalling to occur, I have only one record issue of this happening currently, in this example a Tiger IIs turret is rotating, causing the round to penetrate, create 0 secondary effects, bounce off the mantlet doing no damage, THEN killing the commander. This is a little silly but I have seen much worse examples, like 28 pounder rounds going through 76mm Sherman mantlet, out the back of the turret and doing 0 damage.
More detailed internal modules would be good, but I am sceptical you’d find good sources for 80% of the vehicles in game for wiring etc. And it should also include damagable autoloaders (not modeled at all) and armoured bins (only modeled on a few modern things skipping older vehicles like Cromwell).
Stunning could easily be extremely annoying and unpopular, so I’d like to be able to test it first. I can imagine situations where drivers get stunned that suddenly halts the whole vehicle. (also frankly can we change that? Can vehicles retain momentum on death / driver killed? So vehicles will keep rolling for a short while, it’d be realistic and more interesting than randomly the parking brake being applied)
Healing I think should be limited, like kept to healing on objectives only.