I used registax to create the B&W/normal shot. The colour was taken from the sharpest shot processed from the raw and then the saturation ramped up. Adjusted the tones with H/S/L to get them a bit more natural subdued looking then I gave it a slight blur and set it in colour blend mode and adjusted the opacity to suit.
registax is great. I have not tried Raw mode yet. I have only had this camera for about a year and not much time with astro shots. I am still learning how to use it. I was still using film not long ago! lol