Changing Spell Schools

[Squizzo]

Is it at all possible to change the school that a spell belongs to?

Say for example, changing paralyze and mass paralysis to be illusion spells. If so how would I go about this because I haven't found any obvious way to do this.

 

Also is it possible to make the concentrated poison perk a constant racial effect or otherwise make it so that a custom race starts with the concentrated poison perk regardless of level or alchemy skill.