If genes that increase schizophrenic risk increases cognitive abilities you should find people who have high polygenic scores for schizophrenia without having schizophrenia test well on these cognitive abilities. I'm not aware of any of data that shows this in a convincing matter. I think I've seen a few small studies but nothing that replicated this on a large scale. And most of the studies show they score worse on…
But the optimal thing might be to have a number of more typical/boring people to filter their ideas through, and that might be hard to test experimentally