Dont know where there is a way inside ini files, but there for sure is one. Especially for the healthpoints.
But ... there is also an ingame way reagrding will, if you give your soldiers the PCS that adds Will to their stats, dont know its english name.
Not a real good solution for LW2, cause mostly when you get that PCS in masses most of your characters are already beyond that point they panic for every fart ... but for having rookies in your squad for training it helps.
And I totally understand what you mean, I also often did think ... ♥♥♥♥♥♥♥♥♥, this is a kind of marine ... and he panics cause he broke his little fingers nail ... but not the only thing in LW2 that is a bit ... well lets say it this way ... one can also exaggerate.

For what it's worth, I'm basically certain the minimum hp on a recruit is 3; out of my over 60 recruits I've had, I've not once seen one with 2 hp (though I think I saw one with 7 0.o). And re:panicking, it's mostly an issue for recruits. Keep in mind- aliens are often using ♥♥♥♥♥♥♥ railguns. Even geting grazed and getting your armor blown off? Two inches to the left and you'd be missing half your torso.... I can't say I blame them for getting scared.

I had non rookies getting scared by being grazed... Also, its just me or the chance to be stunned by the robots is too damn high? (I think from 10 stuns i took, only 1 didnt got stunned)

Another thing i have to ask, how the hell i change the chances of getting a mission when i scan? I only have soo much soldiers for a few missions, not 10 at the same time

@Rafal

Did not get you, do you mean you have not enough missions, or too much?
If its too much ... the thing you really shouldnt do in LW2 is, take every mission, a core part of it is to choose missions wisely ...

Too much missions. Well, i don really have a choice at the moment right now. Also, i must ask, is there a way to preview what are the skills of a class ingame?

There is a mod, that shows you all skills, also the ones you did not qualify already for, but I dont know its name.
And about game mechanics, I suggest you read some advice about early game, for example here:
http://gtm.steamproxy.vip/workshop/filedetails/discussion/844674609/135508833658398373/