Adding ways to improve existing units/abilities with fuel should have been done pre-release. Totally agree. SVTs on cons is a great idea. I also think certain units that struggle to be useful without vet like PGrens could be helped with making an option to purchase veteran infantry that has an additional fuel (and maybe MP) cost.
What like the BAR and M1A1C (sherman upgun) in Coh1? That I could get behind. The part about veterancy for fuel was a thing for a while (elite troops doc for ost, veteran riflemen for usf rifle company) but it got removed because it screwed things up or something.