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I would imagine your white stars will be clipped but any star that exhibits colour should hold an RGB value of some degree. Are you saying your Raw files show every star has a value of 255? The star colour is usually subtle, it may be your exposure that it causing the issue because it won't take much to blow out the colour. It's certainly a juggling act in capturing faint nebulosity and correct star exposure. Maybe you could combine a few subs of lesser exposure for the star colour and add them to your longer exposures.
I know DSS can clip your stars, so I usually make curve adjustments to the highlight end of the histogram to maintain the colour. This means my autosave file is no longer linear but that doesn't worry me. This won't work though, if your Raw subs are clipped to start with. It sounds like a little experimentation may be necessary to achieve the desired results.
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