What is this AI script name ? Do you know ?
I will try to answer to your questions.
1.It seems that's impossible to do this. Have you seen in any scenario or campaign cyan text ? If yes, ask the author.
2.It is very difficult to do that. Well, maybe not difficult but you have to listen me carefully. You have to use effect called Change Alliance. For example - On the map, you have three units (Unit 1 called - Rahn, Unit 2 - Jerec, Unit 3 - Kyle.). You want to attack Kyle (Unit 3) using Jerec (Unit 2). All units belong to another player. Everybody are ally. So you use trigger, where you put effect called Change Alliance. Player 3 (who has Kyle on the map) must to be you enemy. So your trigger with Effect Change Alliance looks someting like that :
Example
Trigger 1
Condition - Timer 10
Effect - Change Alliance : Source Player - Player 2; Target Player - Player 3; Alliance - Enemy. When you do everything alright, Player 3 will be you enemy, so Unit 2 (Jerec) attack Unit 3 (Kyle). You don't have to use Task Object, because when Player 3 is you enemy, Player 2 Units automatically attack opponent units. Good luck !
3.You need to install mod. You find them on SWGGB Heaven Game (Section Download - Mods).
4. When you are creating scenario, on the top there is button called Cinematics. There is option, probably called Scenario Instruction Map. You must have one file (put it in your Star Wars Galactic Battlegrouns/Game Folder). Acha, files has to have format bmp (bitmap).
5.Really good question. I want to also ask about it. Hmm, maube AI script.
Ok, I hope that I helped you.