Additional questions on contrastive topics

I found this to be an interesting and thought-provoking paper providing a very thorough analysis of the interpretation of focus and contrastive topic marking in questions and assertions couched in the framework of commitment spaces. In this commentary, I would like to discuss a few points that drew my attention, not because of any specific problem they pose, but rather because I think this framework, as presented by Kamali and Krifka (henceforth K&K) in this paper, opens up new avenues for research on topics related to the role of additive particles, differences between presuppositions and post-suppositions, the criteria used to judge competition between question forms and the implications of CT-marking on wh-phrases.