How is my suggestion that far off from what you call a "tweak"? I'm not calling for the ability to be nerfed into uselessness. I like that it gives the RE some early game combat potential, I just think its grossly over the top at the moment. Limiting the suppression to one squad and forcing the RE squad to remain stationary would still punish advancing units, and would encourage the ability to be used as intended which is to suppress a high priority target like the sturmpios in the early game, rather than being able to suppress multiple units.
Volleyfire is Americans answer to early game blobs, because they don't have a suppression team until lieutenant tech. Only being effective against one squad means that it becomes a sturmpio/pgren pinning tool.
Additionally, making them immobile allows people to just focus fire them from range and then walk away if they toggle the ability. It will go from "useful" to "never used except when your opponent isn't paying attention".
You're essentially suggesting to completely change the utility of the ability. I'm just suggesting making it take a few more shots to suppress so people have time to walk into cover, garrison buildings or just kill the RE outright with focus fire.