Sure, and Saturn should have a lot more. Mars should have 2, and so on.
Mainly in that area I was going less for realism and more for making it fit the SEIV universe.
I have always assumed that never seeing more than two moons around a planet could be justified simply by assuming only certain moons would be large enough to support a colony. Below a certain size and a planetoid is more of an asteroid then a moon.
You could simulate it by putting asteroid fields in the same sector as the gas giants I guess. Then you would have your colonizable planet and one or two colonizable moons, and a constellation of smaller bodies only suitable for robo-mining.
Geo