Single usage versions of skills?

[BraselC5048]

I'm wondering about reduced point cost versions of skills that only allow a few things a character can do with them. I had two in mind; first is Electrician for the sole purpose of the types of things a thief would be interested in, such as cutting power and the like. There's no way you could possibly build or repair something, and in all likelihood you don't even know what tools to use.

Personally, I'm thinking this might end up being wrapped up under something along the lines of Solder skill (from GURPS:WWII), that has far less equipment usage but much more in the way of tactics (in fact it's mostly tactics, but mainly not for combat use). IQ/Average sounds a little cheep, IQ/Hard seems a little expensive. Considering Tactics (Police) is IQ/Hard, it would probably have to be that. On the other hand, it might just be Tactics (Thief).

The second is Judo that only is usable for escaping from a grapple, and nothing else (it's Karate instead for everything else, a very no-grappling style that encourages immediately trying to break away). Basically, it's a way to improve that roll from a plain quick contest of ST, and just about everybody who knows the style is going to be at a disadvantage ST-wise.

EDIT: What skills/techniques exactly can you improve to help with trying to break free from a grapple? Anything?

I'm thinking perhaps treating the second one as a technique for point cost, but using attributes rather then a skill, and can be bought up past attribute level.