I would love to have that feature so i can host fighter matches, like how it's done in IL2 franchise
Would love to host 4v4 or 8v8 Fighter matches
For example:
MUSTANG [D] vs 190 [d-9]
MUSTANG [D] vs HAYATE [ki-84]
MUSTANG [D] vs 109 [g-14]
THUNDERBOLT [D-25/D-40] vs 190 [A/F-8]
THUNDERBOLT [M] vs Ta-152
SPITFIRE [V] vs 109 [F]
etc etc 
Maybe a middle step is use modify the DA so you can sign out a pair of fields...
From the tower of a DA field, there is a clip board option to sign out the field(s)
The person who signs out the fields becomes the moderator
Clicking on signed out field sends message to the moderator who 'accepts' or 'denies'
Only folks accepted by moderator can up from a signed out field.
Radio adds Field labels as Channels [Example Radio can be set to A24] (this will help keep chats and com private)
Range Vox is changed from 'Friendly within 6k' to everyone who upped from the field you towered from.
The Other field in the pair can be tuned on 'transmit' channel [for talking to the other team]
Limit the number of fields that can be signed out [1/2?]
This would mean arena settings and Maps have to remain the DA settings and maps.
Issues might be people signing out fields for long periods of time and not using them, but a little thought on time requirements and usage requirements could solve that.
A party crasher could still fly over from an adjacent field, but hopefully that behavior would be limitted to real knuckleheads.
Maybe that's easier to do than setting up private arenas, so it could be implemented sooner, But who knows...I thought they would be good mods to the DA anyway and might give the H2H folks something similar to what they had before.