You can create list as it was done on sukhoi: who fly both sides, red only and blue only.
For example:
Yellow_team (universalists):
1. Stealth_Eagle
2. Valec
3. ATAG_Krupi
4. 310_Cibule
...
Reserve (Luftwaffe only):
1. ATAG_Colander
2. ATAG_Doc
...
Reserve (RAF only):
1. Pomidor
2. 71st_AH_Macro
... and so on
C'mon, yellow team, be more active!
