WowAce

I just got few questions if you don't mind.

Q1: What is the difference between banzai threat, and just "threat" in the combat statuses.

Threat is the aggro provided by the game, banzai threat is based on the target of the enemies. So there are some differences, for example, if a boss has some mechanic like  targeting a dps to apply some debuff or attack spell, this is not detected by the standard game threat, but banzai-threat detects this case (because the boss changes target).

Q2: About banzai, the hostile casts, can we use stacks to determine multiple ppl casting the same spell? for example, if in a instance, three mobs are casting frostbolt on the tank, why can't it show 3 at the stack position.

Because the status was not coded in this way.

Thank you, Is there any option statusus for LoS, for example in PvP if I heal a friend and he's loss, I can create a bar which cover his health that blinks once when I try to cast a heal while he's LoS, is this available in grid2?

No.

Last question, when someone is inside a vehicle or in some type of a game that he's inside of murky for example or anything like that, it changes the Grid name text into Murky or "vehicle name" etc, but how can I know the player name in that case, if say 25man raid and someone entered a vehicle and I want to know who that person was.

You can go to layouts -> Editor -> and uncheck the "Toggle for vehicle" option.