1 - I am afraid that I do not like the idea. Vehicles are already quite fast and I do not want to shift the Balance totally to vehicles/ aircraft. If you have however a specific idea for a vehicle, post it here and we create the estimated points values together.
2 – Quick answer – up to you and your gaming group. Longer answer: The question is perfect to explain why it should be up to the players to decide which of the ViDe units to use.
There is the old SW/ STrek joke: “A Stormtrooper shoots a Trek redshirt, he is missing but the redshirt dies anyway…”
If you like your Stormtroopers like shown in the movies – expandable extras that can’t hit a barn give them lousy armour and enforce a re-roll on all successful shooting attacks. If they should be more “realistic” give them High-Tech Multirole Combat Suit.
3 – The IFV naked without the weapons cost 95 points, feel free to stat it out with any weapon you like as long as your gaming opponents agree
Light tank gun – 55 p
AT Missile – 30 p
Co-Axial MG – 20 p