Pause the project if the user is inattentive

This may help, I answered this in another thread.

You can execte this JavaScript on the first slide onEnter in an advanced action or just execute JavaScript.

It will pause any slide if the tab loses focus. It will then resume when the tab regains focus.

The only caveat with doing it this way is that if it is at the end of a slide, it will resume to the next slide. This can be fixed but it involves more JS to detect the end of a slide.

document.addEventListener('visibilitychange', function(ev)
{
if ( document.visibilityState === 'hidden')
{
window.cpCmndPause = 1;
}
else
{
window.cpCmndResume = 1;
}
});

You will not like my answer...

As a former professor, may I ask if you really want to treat adults with so much distrust?  Not at all recommended for efficiency of courses, learning and coaching are based on positive attitude, not on a Big Brother Watches You mentality.  

I am happy that there is no easy way to detect 'inattentiveness' in an objective way in Captivate. In Europe that way of control would even be considered a violation of the privacy.  As I told my colleagues in college complaining about students not attending their lectures: try to reflect on your lectures, what is wrong, what is not attractive, how can you improve, what is needed to make students want to come to your classes, to engage theml?  Same for eLearning courses, maybe even more important since most of them are asynchronous.