I think Ik is important tool for posing or animate like in other advanced 3dApps ,maybe the problems are poser`s IK not great like other apps,but it still ok .. and worth it to use Something i never understand are a lot people here suggest not to move the body part ,i know its about save pose problem , but in posing or animation why ... ? With move body part u can achieve pose without make the other part out of their limit