For example when someone plays Ironman and e.g. finishes the game, you can see in the history log (assuming it is working now) that no cheats were used and the version info will give you that Ironman mode was used.

And? How does the History Log improve your gaming experience?

You know, Jagged is a very strategic game but playing without Ironman mod make this game more poor... You dont hav to run for cover when your gun jam, you run all your APs without to much caution, you dont put all your mercs in the same house crying for a miracle... and the medicine skill is useless if you want!...

I know 1.13 is buggy, how often does it crash during a combat? Is it possible to play a combat without crashing?

M1 Garand has a very long range for and old semi-automatic rifle, he kicks-off Mosin Nagant and K98 has a sniper rifle, this isn't real.

Some modern submachine guns ranges are much lower than olders submachine guns.

Indeed olders smg have longer barrels then the modern ones, but a modern smg, like the MP5, even with a shorter barrel has an effective range between 100 and 200 meters while olders smg rarely reach 100 meters. The barrel length alone does not make an old weapon shots better then a modern one.

And speaking of favor, why Thompson has a range of 20 tiles when in real world this weapon is already at the limit shooting at 50 meters?

I dont took into account just how far one bullet from the real weapon can go, but how accurate it will be. While and older smg can shot pretty far, it has a very short effective range to modern standards. In fact even a 9x19mm can travel a mile away but isnt accurate beyond 100 or 150 meters.

but even good mercs like Blood (with Throwing skill for christ sake!) sometimes cant miss a tree next to him.

I wouldn't mind a difficulty setting that would only allow you to save (for example) 2 times per sector battle.

Not as hardcore (and frustrating) as Ironman, but still challenging since you would have to manage your saves during battles carefully.