You can easily prioritize a resource by right-clicking on its title and selecting "Prioritize this resource." But it's not as easy to hide a resource. You've got to open Tools > Program Settings, click on Hidden Resources, open the Library in another tab, and then drag titles one by one to the "Hidden Resources" area of the Program Settings tab.
How about adding a "Hide this resource" command to the right-click menu? If you've got lots of resources that you never use cluttering up your library (for example, all the manuscript fragments which constantly get in my way), it would be much quicker to hide them all if you could do it with a right-click command.