To the question no. 3.
Try
http://www.staredit.net/index.php?tutorial=302Try also
http://www.staredit.net/index.php?tutorial=279When disabling, a unit may go into one of several states, this is shown in the latter link.
To 'disable' a unit, got to the trigger, set doodad state, and disable it. Depending on the unit, sc might crash, become invisable, glitch, and other effects.
Have fun
ADDITION:
For number 2, use one of the extended player effects. In the normal game of sc there are 8 players. In reality there are over 255 of them. Placing units of certain players will result in speeding up the map. Don;t ask me.. Ask Hemandi or somone like that.
ADDITION:
Got a list of the effects and how to use them
http://www.staredit.net/index.php?tutorial=103ADDITION:
For question number 2. I don;t think it is possible.