[Agrajag]

HoneyBadger,
It is in fact harder to add from a designer point of view, because the code already supports dual-path spells, so "my idea" is already implemented and therefore requiers 0 work.
Beyond that, I don't see a point in adding new schools that are just subsets of existing schools. It will add flavour, but also much confusion (especially for newbies), and doesn't sound even remotely worthwhile to code...