I used to be one of those troops and we did NOT commit " many atrocities", that is a gross exaggeration, Fact is, if you compare the few atrocities some coalition troops actually did commit to any military in any war, we were angels.
Certainly Panzer Grenadiers would have access to both the paint and sprayers, being as they had to paint their HT's and AT guns. Most likely the troops who rode in them got some leftover paint from the crews.
There was a mod manager programme, but I haven't heard of it being updated to current CMBN/FI standards.
GaJ's is the new CMMODs, last but not least take a look at Aris mods, mega mod madness there.
Southern Italy is a pretty dry place in the summer, and as an old mechanized infantryman I can tell you tanks and trucks turn out a massive amount of dust at the slightest opportunity.