This is a must-have feature. As we know sortExpertMode just switches the way we use multi-column-sort; But what if we want to turn it ON/OFF totally? There should be boolean flag like allowMultiColumnSort which can be used for such purpose. Off course as developer we may be able to tweak this by external code, if this is introduced as a feature focus can be set more on core coding.
Hope to have this available in nearest release.
Thanks & Regards,