I remember there were multiple ways to solve Finster's puzzels, including LAW rockets, STR, and INT. But INT was the most useful.
That was one thing I was always a bit disappointed about in Wasteland - I always wanted to load up my party with high levels of skills like forgery, bomb disarm, alarm disarm, picklock, metallurgy, etc. But these skills were mostly not used. Bomb and alarm disarm each had a small handful of locations you could use them, but the benefits weren't nearly worth the skill points it took to get them up. Metallurgy had like that one cave where you could get some minerals or something. Picking locks was ok except that you could use use STR or an explosive. I think I may have found one place in the game to use forgery, but I don't remember.
However, the more basic and boring stuff like perception and climb were invaluable and the game was nearly unplayable without them. And so often you could just use an attribute, like INT or STR or CHR, to solve a problem at no cost.