Synths need more clothing options.
Honestly, I feel that would make them far more interesting to the eye.
Lame suggestion but easy and doable.
Let them choose to side with the Xenos, Marines, or survivors.
Siding with the Xenos makes sense lore-wise and Xenos should honestly see synths as their gods due to the newer Alien films Prometheus and Covenant with David.
Doesn't have to be that far honestly, but Xenos should at least make the Synth survivor question it's loyalties, much like Ash's "perfect organism" monologue in the original Alien.
There could actually be a reason for Xeno's to RP for once, instead of the normal hive chatter of "more weeds" and "get the hosts".
It could assist by scouting Marine locations undetected, or even acting as a Xeno spy among marines.
This choice should be made within the first five minutes of the round, much like the proposed ways of having hostile survivors choose between Friendly and hostile, hostile spawning them with CLF gear.
Just an idea, also I am not sure if working Joes will make a return, if so they should just be AI mobs that wander and become hostile when someone or somtinhg trespasses in their area.
That could add to RP and give players something more to do.