I always thought it might be interesting to give troops the option to dig trenches or at least foxholes which provided some cover for the infantry against grenades and artillery shells (if they dont hit the hole directly).
Something the USSR also had was the BTM-3 which was a trench digging machine.
BTM-3 High Speed Ditching Machine Walk Around Page
Now I have no clue how many of them have been really used or if they even saw any service in WW2. But I think I saw photos of such similar vehicles on the british side in WW2. The Brits usualy always fortified their positions after they conquered some area as the Germans would regularly counter attack as soon as possible trying to capture the area even if there was no chance at all to really achieve it.
It could be also interesting if engineers or machineguners could create some small position for their weapon so its not that easy to take them out with grenades and enemy fire. Of course thouse would give not much protection against heavy artillery and tank guns.
Also digging anti tank trenches eventualy to give anti tank guns more camouflage and protection might be a good thing as well since I think anti tank guns are somewhat to easily defeated in MP if you consider that Carious a famous Tiger 1 tank commander had much more fear from those anti tank guns and to some degree tank hunters then anything else, since as how he explained it once, they would tend to fire 2 or even 3 times at you before you spoted them even and when ever you destroyed one it would be replaced in a blink. Of course to entrench a gun would take some time but it was usualy always done if the troops had the time, expected some enemy attack soon or simply prepared for a defencive position. Particiularly the Soviets have been masters of using camouflage with the anti tank guns, placing and preparing them at night in already by the Germans cleared villages inside of buildings together with infantry and suddenly firing at the unaware troops and vehicles.
Caption Camouflaged German 7.5 cm PaK 40 anti-tank gun position, North Africa, 1941
World War II database