The only one I've done is climbing above agreed on alt on the way to the fight. You're on autoclimb, you get chatting, suddenly you're 1k above merge alt. Vox just generally gets an 'Oh crap, I'm above 5k!' or whatever and I immediately descend and throttle back so I'm not above the vehicle's speed. Doing that stuff intentionally to gain advantage is just cheesy IMO.
What I don't think is cheesy is maneuvering before the merge. IMO the fight is on as soon as you're within icon other than guns cold on the first merge. I've seen guys that felt the first pass should be level flight, no maneuvering until you pass the 3-9 line.
Wiley.