Hey guys,
I have the latest version of EF, I downloaded the full 1.7 version and did the auto update for the hotfix.
I'm not sure if this is old news, but this is what I recently found out playing against the AI. When the ZiS Support Gun is under the 'Dig In' ability, of course the ZiS arty itself is immobile, but the two extra crew is controllable. It can move anywhere just like an infantry squad, it can even attack when pointed to a target. The AI I'm up against didn't shoot back so I'm not sure if it's the same with a human opponent.
Just thought I'd bring this to your attention. Might be worth checking.