CFM56 thrust tables are readily available on the web, if the airifle was recreated using enginesim based on the rw data (nasa jet model) you would find that there wouldnt be enough thrust to move until a very high TLA/N1 was achieved (much like default ac). The only way to overcome this "default" issue is to set table 1506 of the airfile to an artificially high thrust level at 0mach/sea level idle N1.
So of the engines max rated thrust, it is already pumping out something like %50 at idle to overcome fsims poor modelling (this thrust range would normally be seen towards the 60-70%N1). For some this isnt an issue, but I am a perfectionist and having spent quite a few hours in the BA 777 sim at Cranebank, i want my airfile to handle as close as possible to the real sim experience I have including fuel burn, this means using enginesim to model the engine and rewriting a pure airfile in the knowledge the sims friction will need to be adjusted.
I suspect LM and MS wouldnt change this SIM1 value because no doubt it will break all of the 3rd party aircrafts "shared" airfiles, therefore it has been left to the table 1506 trick to keep all the addons working across the platforms.
The real dilemma for us is what is the actual rolling coefficient needed? I have my own numbers from reverse engineering "known" variables but its till a ball park really.