Although, I'm not sure if that one point in strength is necessarily all that worth it just to use that one unique sniper rifle.
You take gun nut and want to use unique rifle. Better to make up your mind and take point ether of intelligence or strength. You also get this rifle very endgame if want to try it out real bad just eat barbecue or whatever +1 str food is called.
I don't have much experience with temporal but i can say that it will work better with low ap sniper rifle which Black Arrow is not. It's 50 ap per shot.
Crit power does nothing for black arrow.
I kind of just looked at the max skill checks for Mercantile, Speech, Lockpicking and Hacking as well. If those max checks are insanely high outliers in comparison to the rest of the checks they have normally, I'd appreciate the info as well so I could allocate points else where.
Mercantile breakpoint is 130 as far as i remember. Hacking is definitely 130. For lockpicking you can always use a lock pick max is +15. Hacking checks ignore tools.
I never found interloper to be useful every time i picked it i felt like i wasted a feat slot.
You have high perception why take paranoia. If you want high initiative take trigger happy. Or even better start combat by using snipe (like sniper is supposed to) and go first every time. Bonus points for laying traps all over battlefield.
Why no points in throwing?
Snipe scales with stealth you should probably max it.
There is a feat called future orientation it's potentially very strong with stasis but i can give any advice on it.
Why do you need pickpocket?
I would build it something like this
https://underrail.info/build/?HgUHBgMPAwfCoCgAAAAAwqBkZABLVWQ8KGQAAABGZABaATkrMTA1An4zFirCh8KFU0sAwrXCpOKvvATir70B378Sprint is great don underestimate it. Quick tinkering is traps. You wanted traps builld, no?
Recklessness is a good option for specialization if you like crits. Quick tinkering is good spec if you like traps.