Welcome back Iwesshome!
There may have been some new helicopter tutes added since you were last here, so look in the Ed Depot
1. I think the secret is to take away their fuel, and only put it back when it is time to take off. The command? I dunno, setFuel?
2. Sounds totally possible to me, and what's more sounds like you've virtually done it. Its just a question of setting up the triggers correctly. Use "join" and grpNull to make the choppers be in one group or not, depending on which is better for that stage of the journey. for standing off for instance, they will need to be in seperate groups, but for a nice flying formation they will be better in the same group.