You can animate on a per element basis inside unity, but the software doesn't feature a good animation toolset. It shall take you less time to build your clips inside of blender and then export, plus you'll find more resources online.
And to answer your original question, I don't think you can easily pose a character but you can somewhat work inside a graph editor : http://docs.unity3d.com/Documentation/Components/animeditor-AnimationCurves.html
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