The aero rifles not shooting the tunguska at 1:08:20 is because of low cohesion. It even said "falling back" above the unit when you wanted it to shoot.

I wish we had an option to adjust salvo length of arty on the fly.

as for tanks through forest: yes, modern tanks have much more power than WW2 ones. But that's not enough to force down a really large tree - or a few moderately sized ones together. And doing so has an effect on tanks' own structure, too. Go through young forest, with relatively small trees (with weak trunks!) - sure, an odd large tree can be maneuvered around (or through if necessary), bushes will not present much of an obstacle. But solid forest with no road? I just don't see that, at all. Ability to fall a single tree if necessary doesn't mean ability to go through a forest - even if a few trees do in fact fall, they will quickly form a really impenetrable barrier. Going through that would be an engineering undertaking.

At 1:11:25 how can the arty be packed up and moved so quickly? I have been zooming in and selecting each unit individually...

mad max ... lol