Quote
videotape
they should allow for re- merging clips in a easy command
The problem with that is usually people alter the original clip after breaking apart the audio. Therefore, its no longer the same clip to "re-merge". However, you can create a compound clip to re-integrate a clip that's been broken apart, or undo (if it wasn't too far back).
Finally, if your students need to edit the individual audio tracks, teach them to open the clip in Timeline Mode which gives them access to the discrete audio tracks without breaking the clip apart.
Andy