Tracers would be a really nice small QoL addition for kinetic weapons.
Right now the only way to get a visual "bottom of mag" warning is to load incendiary rounds at the end of your magazines (which I do with 4 incen) (or look at the ammo counter which you cant always do). But incendiary is locked behind research, does extra fire/heat damage, and generally isn't what you always want.
Tracers should just be bright glowing visual effects on bullets — no ignite, no extra damage.
This would make the Mk58 and other kinetic guns feel much better to use without needing to burn science points just for basic visibility.
(I do believe this is a small change and can be done.)