This is pretty minor, but the mechanic's custom rig's ability to function as a comm unit came in really handy when I played one. It meant I had one less piece of gear to track, and made sure I had some basic computer functions always available (like a camera, infosphere access, and some note-taking ability).
Giving the custom scanner the abilities of a comm unit (or at least some capacity for upgrading) would be a nice little quality of life improvement.
"Personal comm units are common, inexpensive devices that are
capable of communicating with each other on a single planet
or between ships orbiting a given world. Small enough to be
carried in a pocket, they also come automatically integrated into
all armor of 1st level or higher."
And it is further confirmed by this armor property mentioned somewhere in the first AP:
"Armor with the archaic armor special property counts
as archaic for the purposes of the archaic weapon special
property ( Starfinder Core Rulebook 180), and it does not
have a personal comm unit or environmental protections."