I'm making this thread as a result of the thread I made, suggesting to give medical borgs a 4th module slot. Instead of that idea, I think this is a better one. However I recommend reading that thread first, since a lot of what was said will still apply to this discussion.
Anyway, here's my suggestion: Instead of a fourth slot, make the health scanner BUILT IN to the actual borg. So rather than it being a module, just have it be default active all the time. So that if we click on someone with no module selected, boom it'll give us a readout just as if we had used the scanner.
This isn't just about making it more convenient to scan people, it's about freeing up a module slot for other things. My standard loadout is scanner, cyborg hypospray, and defib. If the scanner were built in, my loadout would instead be the trauma kit, hypospray, and defib.