It would be 1000 times cooler if we have a tab in items named "Materia" or maybe in main menu and then we see a list of our Materias next to our equipment and are able to put materia in and out however and how often we want. Its just too complicated as it is. Who wants to keep those hundred things in his mind with everything he does in this game. Rar materia drops from bosses etc. would also be damn cool. Whats the problem with being able to put materia in and out when ever we want? It would be great if it was just a bit less confusing