This one should be much easier to both make and explain than my last. This being a new verb added for mobs with synthetic eyes that allows them to toggle an eye glow that acts the same as the 'glowing eyes' trait. This will allow any species to have glowing eyes so long as their eyes are synthetic, addressing Ace's concern of races having access to custom traits without good reason.
-from https://forum.vore-station.net/viewtopic.php?f=20&t=1586These sort of traits are restricted to races for a deliberate purpose of keeping some semblance of immersion.
Synthetic eyes already have a verb to allow the mob to change their eye colour, I wouldn't say it's unreasonable for them to have a verb to turn glowing on and off.