I gave it another thought, and realising acib blob pistol would trigger Deadly Snares (and corrode armor), came to an even thinner spread build:
http://underrail.info.tm/build/?AwGloJgVhBmEAcdkEYIhaA7BtiBsGsM4YIALKafiiAJzoMhbyzxMqzqifdmRxW5OEnLpy8ckiiEaIfPCwwshBLUyE0CIAAttributes:
Str: 3
Dex: 7->8 @lvl12 (9 with Eel sandwich)
Agi: 3
Con: 3
Per: 10->12 @lvl4,8
Will: 8->10 @lvl16,20
Int: 6->7 @lvl24
Feats:
1: Opportunist
1: Marksman
2: Tranquility
4: Thermodynamicity
6: Premeditation
8: Special Tactics
10: Ambush
12: Fatal throw
14: Critical Power
16: Deadly Snares
18: Elemental Bolts
20: Locus of Control
22: Quick Tinkering
24: Bowyer
Offensive all-in, CC machine. Reliable flashbangs (tranquilising bolt if few enemies) and incendiary grenades (or incendiary bolts) for Special Tactics and Ambush respectively. Quick tinkering for melees or for placing mines near the crowd then throw some fireworks. Having 3 sources now (Ambush with good Stealth gear, acid pistols and traps), it should be more realistic to assume I'll be critically hitting quite often.
12 Per instead of 16 however, but CC & Ambush should solve the precision issue. Fatal Throw for that neat execution + 3 AP so that you can shoot 3 times with a 17AP cyclon. No Psychokynesis since shock bolts should do the job for less AP.
I won't craft Spirit Poison but saved ~40 skill points, much needed elsewhere. No lockpicking/hacking/evasion (tailoring/electronics could be removed but I feel like they are overall better options). I should still be able to try the cool guns, just for fun. A SMG wouldn't be that bad for situations where acid pistol is not needed due to the other 2 sources.
Any thoughts about it?

-Would you pick Pyromaniac instead of Thermodynamicity?
-Is Thermodynamicity AP reduction applied before Tranquility (e.g. Cryostasis for free) or the other way around (Cryostasis for 2 AP)?
And btw I don't know if I should wait for the expansion or the patch prior to it...