Add more and they always have an effect, its not based on their stars in a certain research area.
Every tech has a certain number of points required. Adding more gents who have a low skill level may not visibly decrease the number of turns needed, especially for higher end techs. And of course diminishing returns after the 3rd gent, not the second.
Gents can get traits which boost all research (tenure, librarian etc) and traits that boost a certain area. Note that the trait gain for specialties is not entirely dependon on the research at that school. YOu can be researching enlightenment and getting agriculture traits for instance. This only seems to be the case for those 2 research areas tough, military gives military only (except for ancs, you can get anti military ancs while studying military).
Note the cap of 12 for any agent type.
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