Thanks for confirming decompiling won't screw the script. I actually went ahead, and decompiled Companions script and edited them a little.
I still don't have 5 companions, so I don't know if it works like I want it, but at least Sulik showed me his home village on map, and Vic changed his...
I've decided I could play FO2 again (like I usually do each year at least once). Wanted to try Restoration Project, but I've read that it doesn't support unlimited companions in any way, and since it use companion scripts, I can't just swap them with some other mod.
So I thought - why not...