The idea is interesting, I bounced this idea around in my head a long time ago but decided to shy away from it because of my hate for runewords. However, runewords are almost never made now aside from ones with auras on them. I would consider this, but I would definitely have to nerf almost all rares that have runeword potential, such as weapons, armors, helms, and shields. Also to enable this it actually requires code editing of the game's dll files, it isn't something I can just flip on unfortunately. I will have to decide if is worth the trouble.