I'd say get rid of the memory system but leave the source point requirement for the mega nukes atleast for the RPG campaign. If they want to balance for pvp then have 2 systems in place, 1 for pve and 1 for pvp. I strongly disslike busywork wich is what i call it when i have to swap in and out skills and or spells on a regular basis wich the memory system forces me to do as is.