I'd like to see altitude perked.
The perks taking effect at 12k.
Take a D-3 to 12,001 ft. it costs ya a couple perks.
Wanna go higher? Its gonna cost ya Mr. Jones!
The higher ya go, the more it costs.
Give new guys a couple hundered perks free to start.
No perks left? No altitude for you! Plane will not climb over 12k.
Of course if ya land, it costs ya nothing.
This would include Buffs.
Might keep fights at a resonable level, and keep guys from hiding from fights using altitude.
They tried funneling fights in the horizontal, maybe its time to funnel them vertically.