What if, instead of 6-man rifles, you could get a 6-man LT or Captain? They're already special riflemen limited to 1 each, so they could gain abilities that would be too strong on mainline units.
Like this idea:
So, replace rifleman flares with "Forward Observers". 3CP upgrade for LT/Captain, but only 1 at a time. Adds a (cheaper) flare ability, a Pathfinder, and an artillery ability (I&R Pathfinders, Major? Not sure). Takes up a weapon slot.
Just do that, buff Fire Up (lower cost or no exhaustion), and the commander is good, I think.
Interesting idea, but I don’t think it fits the theme of Rifle Company.
The Veteran Sergeant is intended to be a single doctrine only upgrade for your basic infantry, much like the Veteran Squad Leader upgrade that is available to German Infantry Doctrine only. Like the VSL, the Veteran Sergeant is intended to add durability to the squad and a little bit of firepower, but not as much firepower as other upgrades. So if you want more durable Riflemen, go Rifle Company for the Sergeant. If you want more firepower, go infantry or tactical support and get the M1919A6 on your Riflemen, or if you want moving firepower, you get double BARs.
The Sergeant idea is not just to give out 6 man rifle squads for the sake of having bigger squads, it’s intent is to provide USF players with a choice to invest munitions into your core infantry in three distinct ways for different purposes and play styles.
Grenadier LMG42 or Riflemen M1919A6: long range, stationary firepower.
Grenadier G43s or Riflemen BARs: mid range, mobile firepower.
Grenadier VSL or Riflemen Veteran Sergeant: added man and added durability, but less added firepower compared to G43s/BARs/MG42/M1919A6
Your forward observer idea sounds really cool, but I think it fits better with Tactical Support, or Recon Support or maybe a future Commander.