Add it to my list of additional features on ACBC, Aaron. I have a project where I really would want to model alternative-specific summated pricing based on brand choice. The range of prices associated with each brand will be radically different due to the brand constant, and also as a brand-specific sub-brand feature which is also alternative specific. A single effect may not make a whole lot of sense.
My work around is power coding and doing the estimation outside of ACBC with CBC/HB, which is a problem because we also want to compute the buy/no-buy threshold for the concepts and I'll have to replicate that outside of ACBC as well.
So...can we add support for alternative specific-defined summated pricing to the next release of ACBC?