Flash CS4 is really good for design and development point of view. But I noticed two things:
Please let me know if I am wrong!
You can select any object in the library and delete it. You can select multiple objects in the library and delete all of them at once. I don't think that I want a "delete unused items" option for the library. There are many instances where the Use Count option will display 0 for an object that is actually used by another object in the library.
Flash doesn't include unused objects in the final .swf, so there's no file size penalty for leaving the objects in the library.
Yes, there are many hideous window problems in Flash. Most of Flash CS 4's interface "improvements" seem to be designed to decrease production flow and increase production time.
why cant you use the option from library panel's options?
Your asnswer is obsolutely right.