Yes, we do this all the time. It takes no special code - just add the rating scale purchase intention scale right below a forced choice CBC question. The software isn't set up to automatically integrate the scale question in the utility estimation, but it's easy to add manually - either you dichotomize the rating scale question and then run it as a DR none or you can assign probabilities of choice to each point on the rating scale (e.g. 75% for definitely will buy, 30% for probably will buy, 10% for might or might not buy, etc.). Analysis of this second option, called "allocation none" is only a little more complex and is described in our book Becoming an Expert in Conjoint Analysis.