Fire support is a great concept but has a few flaws and limitations at present. Like the need for interplay between team members but this needs further enhancement.
The observer currently does not observe and is simply a radio man. The obsever should observe and suggest targets for the commander to call in. It would therefore make sense to equip the observer with binoculars to call out targets for the commander. The area effect strikes should be called by the commander from the map using radio and not rely on line of site. Commanders binoculars should be used to highlight enemies and areas to the team for orders.
Allow all team members to suggest fire support. Allow the Observer to call for commander to call in strikes. For targeted attacks equip observer with laser designator which is used to "light up" targets for gun ships or bomb runs.
Fire support and commander orders should form a more important role of the game and help reduce rush and camp gameplay.