From 60km to 210km would mean, give or take a bit, 42x as much space and, presumably, resource drain from that aspect of FS (note, from just that aspect - not 42x as much drain from FS as a whole). Even upping it to just 100km would more than quadruple it. Not having looked much at the FS2 source, I can't say exactly what the impact of the limit being changed would be. But I have to assume that since it's there, it's there for a reason. I hate the limit myself, just out of principle since I don't like being limited in where I can go, but I have never really had it affect me while playing. So basically, I can live with it.