Are my subconscious channeling sessions enabling recall of past, present, or future life extensions in addition to past lifetimes?

This indeed is the case. As you might expect, if such extensions are a factor in the health or well-being of the person, to the extent they represent trauma that is causing inner fears and conflict within the deep subconscious mind, it is through being seen and embraced as seeming history of the person themselves and taken to heart that is causing the difficulty. So this, in fact, does happen with regularity.