How to get Bozar?
As for our actual 2d critters, yes I think its a must to create everytime a new .dat file.That's why it's so urgent finally creating all the needed stuff for the 3d critters...As for the other question - dunno.
If weapon has requirement for strength 6 and my char has 5 will it affect damage of weapon?
Nope, it will affect your skill. With your scenario, you would suffer a -20% in your weapon skill.
So wasting perk to negate it for ew sniper is bad idea in this case?
Yes, better idea would be if you would just invest some more points in your Energy Weapons skill, which would negate your ST check.