The UAV is super powerful because accurate information can mean be difference between life and death for squads whether that info be the location of a tank (or the direction its looking), enemy inf sneaking to flags, AA mortar etc because remember someone will always look at their map when a commander mark is put down because its good info (if the commander is reliable).
Encourage? If the situation calls for it I always try and get me some fireworks but remember that as the one who presses the button its your responsibility to inform squads before you call it and where so no one gets tk'd and people can move away or get to cover.
The only good things you can do frontline would be set up good FOB's or Necessary Defenses random wire everywhere does nothing if the bots just walk past it.
Or just be @|*|>>RESCUE<<|*| he's a wizard.