TL;DR The problems you mentioned have already been changed.
Visionhunter wrote:
Storm Bolter
The fact that this weapon's fire power is only at 60% of the Bolter's and is far less accurate makes this instantly one of my least favorite weapons. Its 67% larger clip size seems like a nice upgrade but its horrible accuracy prevents you from actually hitting anything with it that isn't standing right in front of you. It only outshines the Bolter at very close range or perhaps against very large groups at medium range.
The Storm Bolter has been changed drastically for the next update. The accuracy and damage has been greatly improved but the rate of fire has been halved.
Visionhunter wrote:
Stalker Bolter
A great weapon: Silenced, extremely accurate, great firepower, fast reload, decent clip size. A direct improvement of the Bolter if you prefer sneakiness/long ranged combat over medium to close ranged combat.
Don't get too attached to it

. This one is also getting changes
Visionhunter wrote:
Sniper Rifle
Another mediocre weapon. Its accuracy and clip size are similar to the Stalker Bolter's, but it comes with a list of handicaps far outshining its single improvement over the Stalker Bolter: the scope. It has a much lower rate of fire, less firepower (!), extremely long reload time (single round takes longer to reload than the Stalker Bolter's whole clip) and it is not even silenced.
The v5 Sniper Rifle has a higher rate of fire and faster reload time. Not sure where you're getting the low firepower from.
Visionhunter wrote:
Shotgun
Wasn't a fan of shotguns in the base game, still not a fan now. With a mere 5 rounds, low rate of fire and long reload time this is not a weapon I expect to ever use again. It's great a close range only, and if you miss you're screwed.
The v5 Shotgun also has a higher rate of fire and faster reload time, along with a higher capacity
Visionhunter wrote:
Plasma Gun, Lascannon, Missile Launcher
The reload times for the Plasma Gun, Lascannon, and Missile Launcher are shorter in v5. The Plasma Gun's rate of fire is getting a nerf too
Visionhunter wrote:
Sonar weapon thingy
Forgot the name. Not a bad weapon against huge groups or at very close range. Terrible in any other situation.
I haven't thought of any ways to make the Sonic Blaster more balanced.
Visionhunter wrote:
Bolt Pistol / Plasma Pistol
The Plasma Pistol is the weapon of choice for the AI against vehicles, for some reason. Its doesn't even damages vehicles as far as I can tell... Perhaps they are programmed to see it as a LAW...?
The Plasma Pistol is pretty terrible regardless. It's only effective at point blank range, but its ridiculously long reload time PER SHOT makes it extremely ineffective.
The Bolt Pistol is nice to have if you're not using a Stalker Bolter or Bolter as your main weapon. It's not too shabby for what it is - a sidearm.
The Plasma Pistol is more for fending off melee attackers than picking off groups of enemies. Not that useful vs AI, I admit.
You'll be getting more sidearm options in v5. I might make the Plasma Pistol a strictly antipersonell weapon to keep the AI from pulling it out every time they see an enemy vehicle. It's too bad you like the Bolt Pistol so much, it's getting a slight nerf.
Visionhunter wrote:
Suggested, aside from every other weapon from the 40K universe, of course:
The Stalker Pistol
Would be nice to have a silenced Bolter Pistol (clip size 5 or 6?) to be able to take down enemies silently without having to rely solely on a weighty Stalker Bolter.
I try to avoid adding weapons that don't exist in the Warhammer 40k universe. I might add a "Stalker Pistol" but I like the idea of having to specialize in a role. With the Stalker Pistol, everyone can be a stealthy assassin.