If Creator is not guiding the deep subconscious to work on particular issues in the way sessions of DSC-TR are conducted currently, can this be requested to happen, so that the most important karmic events will be identified and given healing attention?

This is a quite important point you have arrived at, in wanting to ensure that precious healing work is devoted to those things of greatest significance and importance to achieving the most productive healing in the most efficient manner, so involving Creator more directly in defining what gets worked on will further empower each session significantly, as you are envisioning with the questions you are asking now.