Organizing my reading list in Mendeley I keep publications from the literature in Mendeley for later reading on my iPad. There are many publications, so I need some sort of way of prioritizing the ones I need to read first versus the ones I might read someday. Right now, I use folders with varying priority levels. The biggest problem is that I cannot move articles to different folders on the iPad, so I have to do this prioritization while I'm at my computer (where I usually have more important things to do). Also, I feel like I spend most of my time assigning priorities to articles rather than reading them, which is not ideal.

Do you have better suggestions on how to prioritize and organize the publications I want to read using Mendeley?
One option would be to create a tags P1, P2, P3, P4 ... and assign "rating" to articles how much priority they have. Tags could be updated as priority changes. 

(similar system could be used with Delicious.com tags to websites)

Tags are more flexible then folders. Mainly - Multiple membership in more than one tags