I suggest that we need system provided dividers specifying what functions priorities apply to or that a additional option be provided in the advanced options stating what functions the priority applies to.
1. Because the default lectionary layout includes only one commentary, it is reasonable that the highest priority commentary must be lectionary based eo that one can use parallel resource arrows to move through all one's lectionary based commentaries (a personal collection). Unfortunately, this leads to random results. See http://community.logos.com/forums/t/86312.aspx.
2. I have set my highest priority commentaries to the study Bibles of my choice. This allows the default to provide a quick overview while sections in which I have specified a commentary collection has the real meat. Unfortunately two of my top study Bibles are also coded as Bible dictionaries. This shoves 2 of my preferred dictionaries off the list. (shot from Explorer --> Biblical People --> God context menu)

In short, I am becoming more and more inaccurate in setting my priorities because of interactions too complex to keep in mind.