ZBrushCentral

Use textured IMM brushes to make diffuse and disp\normal maps at once -possible ?

Hello! Sorry for noobish question, it’s about extended possibilities of IMM brushes. Generally, IMM brushes like rivets and stitches can be used to make displacement and normal maps, but how about good diffuse maps, to make them at the same time? As an example, these nice IMM embroidery brushes (http://www.zbrushcentral.com/showthread.php?185972-Any-interest-in-IMM-embroidery-brushes) or any other stitch brushes. Recently I saw a tutorial from AskZbrush Youtube Channel about UV-mapped and textured IMM rivets. I want to adapt this technique for small clothing details like stitches and laces etc, but do not know how to do it exactly. It seems I should extract the necessary brush with some IMM extractor, UV map it, then re-import UV-mapped mesh to Zbrush and apply any desired texture like rope or fabric (I want to use simple seamless textures for them). Then I should recreate the original brush from this mesh with all settings. After all this - if I paint this IMM stitch brush upon the clothing mesh, can I save later the resulting diffuse color map along with Disp and Normals? (I mean if the main mesh has its own color texture applied or converted to polypaint, will this new textured elemets be combined with this old texture to get the new one?). Or should I use polypainted IMM brushes instead of textured UV-mapped ones?

Had anyone here ever tried such method? What results, can it produce fine maps?

And alphas - is there any way to make alpha follow a curve, like IMM brushes? i know something like this does exist in other software like 3D Coat. I couldn’t do it in Zbrush yet.
Thank you in advance for advice.