I think it would be helpful to be able to be able to prioritize parallel resources collections. I may want my Bibles to be ESV, NASB, NIV ordinarily. But in devotional reading, I might want to have NIV, NASB, ESV.
If I could drag and drop the items in a collection within the listing in a collection pane, I could create a sub-prioritization, which would only affect the order of resources when using the parallel resources tool for that collection.
(This came up on this thread in reference to lexicons, which is a more believable example than Bibles)