Right now 3 things repair ships:
engies, forts, and the MRS.
engies = cheap, fast to build, often 1 shot kills
forts = small repair radius, no leaving the system (were great with 1 tug assigned to repair everybody in a system)
MRS = large repair radius, tough, moderate speed, high capacity to repair (high repair rate/high simultaneous repair capacity), fits in transports, WH transit
Possible nerfs:
Unable to be loaded in transports -- it can still support border pushes but not deep strikes
Slow speed -- Blob moves correspondingly slowwww if kept with the blob.
Reduce # of active repairs (scale for ship caps)
reduce its health related stats making it easier to kill if it is in the blob
Rework the MRS in a bigger way
Make the MRS the Mk4 engineer unlock or maybe a whole new starship line
Mk1 MRS slow, wimpy, weak, low repair capacity (15 @ a time, scale with ship count) - this would be unlocked @ game start to teach the mechanic
Mk2 slow, stronger, 2x repair capacity (ship cap 4)
Mk3 todays MRS (ship cap 2)
Mk4 system wide repair range, will not fit in a transport (ship cap 1) The king of beachhead support (at a price
).
Edit The concept of unpacking an immobile unit to repair is excelent -- You have to protect it and it cant move with the mob er blob.