Agi is not so useful - you will have many moving points with good tabi boots anyway. You should start combat out of enemies field of view and out of stealth to still have moving points. I played this build with 3 agi and its perfectly fine. In places where you can't trigger ambush try to use acid and ice pistol combo for a crowd control. Also keep in mind that heavy dex investment will shine in lategame only. QT is still useful out of combat - you can set up minefields right under enemies noses.
Well said.
Sprint in the long run (no pun intended) will be of very little use due to more sources of MPs: Temporal Contraction and Jumping Bean.
QT and traps are important part of this build's survival, especially early game.
It's worth having proper armour for the job. Laminated Riot Gear vs melee, Laminated Tac Vest vs bullets, mutant dog (or siphoner) leather vs mutant dogs and big mutants and there's also an energy shield to craft.
Cooked Shot and Mad Chemist are good, so is pyro pistol. Vs big mutants cryo pistol might be better since they are immune to fear. They still take burn damage tho.