Reload is a metadata editor that supports SCORM 2004 and the SCORM Simple Sequencing and Navigation constructs. However, I couldn't find it to download it. Looking at the main ADL site, there are quite a few good presentations about it over on the ADLNet site- Reload Metadata Editor Presentations, but no sign of the tool itself with the SCORM extensions. Fortunately, I was able to contact someone who knew where to find it.

Currently, the Reload Editor is available as a download on the Joint ADL Co-Lab site- Reload Editor 2004 v.1.3.2 beta 2. It looks like it was last updated in late October of last year, but it should still do the trick for most of your SCORM metadata editing needs.