I'd rather they just turned WM into a dps CD. Have it not affect mobility at all and just give a 10% (or whatever number makes sense) damage buff and use up MP. It would be exclusive of the other songs, so you have to decide whether to buff your damage or save those MP for one of the other songs. Makes it nice when you are running something where healers won't have mana issues and you can just go ahead and pop WM and do your thing. Don't see that happening, but I can dream.