Your idea for magic is an intresting one that i like the sound of, however pvp isn't the only area that mages need to be enhanced in, nobody mages any form of monster except barrows, Rex and metal dragons. I think thats a problem. Surely as the majority of monsters are mellee they should be weak to magic? Certainly deamons, METAL dragons, all forms of knights, elementals 9as lnog as you use the right type of spell) the list goes on should all be affewcted heavily. On thing that could be added is an item that adds a proportion of the runes you used to the drop pile so if you used 30 air blasts you might get 10 death runes from the kill.