OK KW
1) I don't remember the exact episode but they showed Federation fighters in the episode where they re-took DS9 from the Dominion.
2) Alas not to date in regards to the Federation, by size one could argue that the Klingons field a fighter, looks like a 35 meter long BOP. There was a Romulan/Reman fighter shown in Nemesis, but not much information was given, nor was it's capabilities demonstrated.
3) Not really, but what are the Tier III maneuvers you speak of.
4) Fighter tactics varies depending on the mission perimeters, some stay with the capitol ships in order to help defend them, others are used to rapidly flank an opponent, some could be used to harass or swarm a target ship so it cannot get a clean shot off, most importantly fighters face other fighters so your ships are not attacked.
Phoenix...
"I'm not saying there should be capital punishment for stupidity,
but maybe we should just remove all the safety lables and let nature take it's course"
"A Place For Everything & Nothing In It's Place"