Q 1. What is the difference between Assault and Close Combat? Assault seems strictly better: you get to move, and you reroll missed dice. Why would I ever use a Close Combat action?
A: Because you are already in CR and want to fight on.
First sentence of 6.2 P. 14: “If a unit starts its turn within Combat Range of an enemy unit it may immediately fight in close combat.”
Let’s say your 1st action was an assault. 2nd action you can CC or move out of CR and Assault again.
Q 2. About Shaken unit Critical Hits: Does each further suppression marker do _two_ hits?
A: See P. 11 4.1.3 Suppression Marker and Shaken Units.
Critical Hit, see P. 10 under Critical: “When an attack is made against this model and after all modifiers are applied its Critical number is equalled or exceeded, the unit suffers two hits.”
Q 3a. - About Withdrawals. Can I withdraw directly towards the unit that shot me if I am safely far away?
Q 3b - Also, what if a unit is forced to withdraw from close combat? It cannot get 6" away since it can only move 4".
A3a: See Page 11 - 4.1.2 Withdrawals: „A unit making a withdrawal may move in any direction, but if a model is after the withdrawal move within 6” of any enemy model, it is removed from the game (it is killed while trying to escape!).
A3b: Please note that the above quoted rule talks about models not units. So yes some models get killed withdrawing but not necessarily the whole unit (if for example some models of the withdrawing unit were 2” behind).
But yes, having to withdraw from Assaults/ CC is very deadly!
Q - Would the game still work if the unit leader were used for ALL measurement; that is, if the actual location of the other squad members were irrelevant?
A: Never tried it, but I have a gut feeling that some additional rules might be necessary.
Q - In my game, we both used a kind of "slingshot" move where the squad leader moved 3" out of cover, then the rest of the squad placed a further 5" ahead to get into range. After this dangerous attack, they all returned to cover. This seemed somehow abusive.
A: No, that is OK. A big game balancer as far as Infantry vs Vehicles are concerned. A Vehicle within 3x4” + Ld of an infantry unit with the Tank Hunter Ability is in Grave danger. Remember that you always are allowed to premeasure. And since you both had done it all seems good to me!
Mike’s reply is of course also true!

I like the game a lot, especially how the action system gives so many tactical options.
Thanks, exactly what I wanted from the game. ViDe is about constantly thinking very hard which actions to take and to anticipate what unit will be chosen next by your opponent.