I think the most common (probably incorrect, perhaps, but still most common) way to estimate WTP involves using utility equalization to estimate how much money a given feature is worth. For example, say we have two levels of price, $100 and $200 and that their utilities for some respondents Jones are -4 and +4, respectively. Now we want to know WTP for a feature that may be absent or present. It's utility is -1 when absent and +1 when present. The range for this feature is 2, or one fourth the range for price (4 - - 4 = 8). One could calculate the price equivalence for the feature as being a fourth of the distance between $100 and $200, or $25.
As you've read, there are a lot of things wrong with this way of calculating a price equivalence and then believing that it really represents a WTP for the feature. Still, if you can live with those, you could do this calculation, at the respondent level, and then use the results as inputs for your segmentation analysis.