I just have to write down my ideas on how to re-balance the game without to break the actual feeling of it. The main part of my idea is to work out a MP charge system. With this system you will generate MP over time in battle. The materia will have an heavy impact to said system, be its generation speed, max MP or start MP.
I had this idea long time ago but didn't thought that it is feasible but with the development of Sister Ray I think it could be done. I will write down in future what I think this mod needs like a rework of the limit system or making a few characters more special. Red XIII as example won't be able to use materia but I would lock enemyskills on him (and only him) so he would come with his own system. Though I'm unsure of how I deal with Cait Sith, because he doesn't really fit into my explanation of the new MP system (stress will activate it but he's a robot) so either I write him out and replace him (lots of options) or he gets his own system as Red.