Yeah, I was lurking on the forums for quite some time, but finally snapped and joined the Dark Side.
You are right, convoy behind you brings up the tension. So maybe a note in the briefing stating, that the EOD squad doesn't have to dispose of the mines, just disarmed them?
Text radio chatter is better than none and in my opinion insanely increases immersion (sorry, that adjective was just for the alliteration). But voice acting is always welcome and for me it is additional plus, however cheesy it may sound; so if you feel like doing it why not give it a try? I would offer my help, but I come from Poland, so my accent would be ridiculously strange in that case.
I'm fine in finishing the mission without firing a shot, but in my case it just seemed like the were shot in one spot and not even disembarking from their quads.
I didn't expect to see such complex behaviour as it would be extremely time consuming (as I imagine), just a minor detail.
Anyway, I am looking forward to play more of your missions (managed to finish all 3 so far), they are very entertaining and interesting from design point of view.