The only way I can find to do it is 'in view edit' - that is clicking on the script library name in the list of script libraries so that I can change the name without opening the library.
I can't bring up the old-style properties box for a script library any more and the library name is not editable in the eclipse-style properties.
There is no refactor/rename option on right-click in the 'applications' view as there is in package explorer view in eclipse. Am I missing something or is this the only way?
I got an answer in IQJam
You can right-click on the element in the applications view - I swear I looked there and didn't see it before.