For the skhval only and BS1 only, to disable the skhval in the 3d view
You need to edit the file SHKAVL_init.lua line 50 and put -- infront of render_purpose.GENERAL
Example
purposes = {--render_purpose.GENERAL,
render_purpose.HUD_ONLY_VIEW,
render_purpose.SCREENSPACE_OUTSIDE_COCKPIT,
render_purpose.SCREENSPACE_INSIDE_COCKPIT} -- set purposes to draw it always