Once you have the desired texture maps in place and the Iray settings how you want them, you can save them as a Material Preset (See the File menu) Then the next time you want to use it, you can simply load the mesh and double-click the Preset that you saved. In the case of a Character, you could also use the Save as Character Preset which will remember the material settings as well, then you can just load the character with the iray maps and settings in one go. Remember where you save the presets... so you can find them the next time you want to use them!