Casual mage, so just wondering, but could Rune of Power be salvaged if it provided a 15 sec buff while standing in the rune that provided the DPS increase, so that if you move you have 15 seconds (or whatever is suitable) of grace, yet not the mana return to prevent the rune from becoming trivial? Standing in the rune would, of course, auto-refresh the buff, so that the 15 seconds start from exiting the Rune.