Apologies to the FotRSU team - I have found that my question about the blue/red colours was discussed previously in
https://www.subsim.com/radioroom/sho...d.php?t=244934 and the consensus seemed to be that when time permitted, it may be offered as an optional mod.
Since explaining what needs doing will almost certainly take as long as doing it, I am happy to wait but please be assured that plenty of folks will be grateful for the edit when it is available.