thanks for your feedback, i really like to have lockpiking or hack in my builds for personal taste, not only for the loot but for access to locked areas, as for metatermics you have an excellent point, i will reevaluate exchanging as many points spent on metatermics being that I only use it as a support for more efficient grenades.
And no, PER has no influence on damage or accuracy in versatility all upgrades come directly from melee effective points (60% of dominant skill or 80% with especialization reaching 288 effective points MAX approximately), so just adding STR and Leading Shot generates some impact on shotgun effectiveness and sixth shell+ full auto on damage on this build at least.
ps:exotermic aura fire imunity sounds fun with napalm grenades