So have you textured the model and now you just want to bake the texture out to a bitmap for the game? If so, you want the render to texture dialog (press 0). Just add an out put map (eg diffuse, specular or complete) and select a size that the game engine can handle, and hit render.

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[Link to www.3dprevis.com]

I think for most games you need all your UVs in the same 0-1 uv space. if you can assign different materials to different parts of a mesh you could simply map the head in its own uv space but chances are you will need to have everything organised into one map. render to texture is good for all sorts of things but I'd say in the case of mapping a character you will probably want to create maps in photoshop using carefully unwrapped uvs. use pelt mapping to get the quickest least frustrating process happening.

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If i understood you correctly, you want to blend two texture maps onto your model? than the correct and the easiest way would be to unwrap your model using uvw unwrap modifier export the wire image and paint your textures in photoshop.

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The secret of creativity is knowing how to hide your sources.
-Albert Einstein

in combining two UVW Mapping,
1. i would first make it an editable poly,
2. select the polys on the head, apply uvw texturing
3. convert it again to poly, then select the body and apply another uvw texturing

but if you need a more precise texturing especially for a more complicated model, i go with altopais suggestion.
what i elaborated is the answer to your first question how to do a double uvw mapping.

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[Link to www.pixila.com]
[Link to www.sharecg.com]

Avoid thinking of it as "double" UV mapping. your model has one set of uvs and different mapping applied to different polygons. If you use a second mapping channel you can have two uvw sets. but otherwise they are just one.

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