We're huge fans of HikaShop, and do a lot of custom HikaShop work, so we'd love to build it. But for whatever reason, there hasn't been very much market demand for JoomLister with HikaShop.
Really surprising to us, too...
Our standing offer is that if a client is genuinely interested in using JoomLister with a new shopping cart that we currently don't support, we'll build it out and begin supporting it in JoomLister IF they will commit to the project by pre-purchasing a one year subscription ($400). It's not cheap for us to add a new cart to the product (development isn't too lengthy because of how we designed the core code, however, there is a LOT of QA testing, product documentation, support costs, etc. each time we add a new cart).
We have only one client who has made only a small down payment on a HikaShop version subscription. Unfortunately, that's it so far for people who are willing to express their interest financially in a HikaShop compatible version.
redSHOP, VM2, MijoShop and AceShop were all built because we had multiple clients who were sincerely interested and willing to pre-purchase them. Not sure why the HikaShop market hasn't been willing to do the same, but it simply hasn't happened. If no one is willing to purchase a year subscription for $400, there's certainly no reason to believe a JoomLister for HikaShop would sell many copies if we developed it on spec hoping for future sales.
We'll definitely share the news here if we get a committed sale and build HikaShop compatibility out!