Oh ya,
Squark I finally figured out why you couldn't disarm traps. I was starting a fresh doom play through and it happened to me where I had 10 points in SUR but couldn't disarm some traps but could disarm others. Turns out there are some traps you cannot disarm because your level is not high enough. After reaching SUR 20, I was able to disarm all traps. Starting at SUR 10, you can disarm some traps but not all. 15 you can disarm more but again, not all.
I am assuming the logic behind this is that some traps are just "built different" there for requiring more skill.
I am not sure if equipment SUR bonuses applies to disarming traps as I have not yet tested it yet, but ya... traps are still a bitch.
Edit1: No. Equipment bonuses does not help with disarming traps. SUR 10 can disarm barely any traps. 15 is 75% (pulled this number out my ass). SUR 20 is all.
Traps are a bitch. Time to level all my lona's with 20 SUR now lol.