I didn't enable the tutorial, it's the 1st mission after shooting down the alien craft. Every time I get one of my soldiers to do anything, as soon as he's done it, the game just crashes out. I managed to find a workaround though: I only edited the weapons, rather than the soldiers, then once I reloaded my original game (before any modding) and re-equipped the weapons, I got the mods to work. So rather than having my soldier's willpower go up, I set a willpower increase to the weapons they were holding, and the sniper rifle range worked too. I've also checked this in a new game, and it works fine. I may be way off course, but it looks like changing things on the soldier's themselves could possibly have something going wrong with a (possibly) scripted part of the 1st few missions.