Some Tactical Questions

[Turner]

Whether it's worth the effort to attack in a different direction other than the main objective is entirely up to you. It can be worth it in some cases where the enemy is still unaware of your main direction of attack. Concerning Moscow '41 the main objective is quite obvious, nevertheless you might be able to make progress elsewhere and/or tie down valuable reserves. However, if your front line is weak and you expose your weakness to the enemy, you may find yourself struggling to hold the line as the enemy counterattack.

Recon is another case of your own decision making. You deploy your troops somewhere you are suspecting to find the enemy positions, but out of sight, then move methodically only between hexes that are in sight of eachother. This way you can minimize losses, as your recon troops are combat ready and moving slowly anticipating contact.

Engineers are just a precious resource that you shouldn't waste. They are useful in attacks on fortified positions, but otherwise they shouldn't take on the infantry role. There's infantry for that. Engineers are specialists, use them to build bridges, clear mines/obstacles and dig trenches (E dig trenches faster than regular inf).