Some info about visor implemented in 4.34.
Visor tint can be defined in 3dckpit.dat via visor_tint_color 30000000; (default value in ABGR hex format).
3d visor model is controlled via DOF COMP_HELMET_VISOR 99 (do not forget to change maxDOF in parent to 100). DOF Range is 0.0 - 1.0.
COMP_HELMET_VISOR can be used to implement visor on external model pilot. None of 4.34 F-16s have this implemented yet.