I was looking for some kind of divider, too. I found a solution which works pretty good at least for my needs.
I created an audio file only containing a few seconds of silence. You may choose a very short time to make it not interrupt your playback. For most visible fields a changed their value to "----------------" so I got an easy visible divider. You are able to change the font color of your divider by using HTML code (something like <font color=00ff00>---------<font>
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I cannot think of a good way to add the divider automatically. You perhaps could add a silent file at the beginning of each of your albums, but that would only work if you always listen to them in the right order. Wouldn't be a solution for me. But perhaps it works for you?!
For most zones I set MC to not play silence inside songs, so the silence file never gets played.