I suspect that IQ tests [and] the like select for people with mild ADD

I'm not sure about this. I doubt I would do all that well on a Mensa-type IQ test, and I suspect ADD may be part of the reason. (Though SarahC has raised the possibility of motivated cognition interfering with mathematical problem solving, which I hadn't really considered.)

and against people who want to do things which are directly connected to their goals.

This, however, I do believe.

Despite Richard Feynman's supposedly low IQ score, and Albert Einstein's status as the popular exemplar of high-IQ, my impression (prejudice?) regarding traditional "IQ tests" is that they would in fact tend to select for people like Feynman (clever tinkerers) at the expense of people like Einstein (imaginative ponderers).