I would rather they reduce the repair speed of UKF and OKW to match the other three armies. It's a bit ridiculous how fast OKW can repair a no health king tiger with repair station + pios, or how fast Brits cab repair with Anvil sappers. Makes it much less punishing to take damage on vehicles for those armies compared to the vanilla factions. Just another example of power creep, should be reduced for them than raised for the other factions.
Also my preference. Repairing Comets or Panthers (Ok, and a repair truck for OKW, but useful popless repairs are still useful popless repairs increasing the average repair speed for them) in like 30 seconds with one engineer squad? Redonk.