Hi David,
thanks for the update, we've been busy working on other subjects and have not made progress on this matter. Integrating the BootStrap framework in HtmlMapMaker is definitely the way to go, yet we haven't found any opportunity for this and the module remains desktop-oriented when it comes to placing hover effects on maps. Let me know if you'd like to participate to this work, I could then prioritize it in the team workflow.
Best regards,
Thomas