Ley lines should just offer a buff to everyone standing in it, OR just be a personal buff on the BLM, for the reasons you stated. Even if keeping up noke is fairly easy, its still frustrating in many high movement fights to begin with due to cast times/whatnot if you plan on dodging consistently. Id prefer the aura/personal buff to get rid of button bloat with between, and just add a second charge to AM personally. Half the time you drop lay lines, expect the boss to plop an acid aoe or something in it anyways.