Ok, that's moving into a core hack, right now the core doesn't provide for this. The file you need is the /hcl/class/live.php
You probably want to note that a newer version is right around the corner, and a major rewrite is in progress. I can put this in as a feature request if you like, and we'll see what can be done. Shouldn't be too hard, it's just basically a switch. Why don't you post on the feature requests board, and see if others are interested in it.