Definitely. I am using the trial version though, not the latest one for subscribers.
If you select a topic in the ToC and let it play the check mark only appears once the media completes. However if you click onto the next topic before it completes the check mark appears. Please do let me know if you can reproduce this.
However your idea with the button is good! What I could try is to lock the ToC navigation to viewed slides only and add a previous and next button to appear after the media duration.
I do appreciate your help. Trying to work out a new environment takes some time! I will let you know if this works.
TVM!