iMovie 7.1.1 appears to have severe problems. I can't even delete these clips that were imported from iPhoto and again, help, support & discussions don't seem to address these issues.
You seem to be missing the point that iMovie HD automatically converts the clips to an edit compatible compression formats as part of the import process as needed. Thus, the additional times required for import. iMovie '08, on the other hand, only imports what it can edit "natively." In the case of the iPhoto clips, no import occurs since the "Event Library > iPhoto Videos" event window is actually looking at the videos still stored (and thumbnailed) in iPhoto.
I get the two step process. But I can NOT do it.
Do you really want to delete them? Remember, if you did not physically copy them to an "iMovie Event" folder in iMovie '08, they are still physically stored in your iPhoto Library and can only be properly deleted by deleting them from within iPhoto. Doing so from iMovie (if it were possible) or the Finder would likely mess up the iPhoto data base. Only clips actually copied to one of your "iMovie Event" folders can be rejected and trashed from within iMovie '08. Did you, in fact, copy them to iMovie '08 or are you merely viewing them while they are still in the "iPhoto Videos" Event Library window?
BTW iMove HD is a two step process to delete clips. The difference is that the feature works on iMovie HD.
Yes, but the iMovie HD process is much more intuitive since it emulates the Finder "Trash Can" deletion process and many people seem to be having a problem with the iMovie '08 variation.