I believe you should be able to have multiple widgets on a homepage, but this depends on two factors:
- What widgets are available to the Org Unit to be placed on a homepage
- The homepage design that defines the placement of tool and widget elements
When you proceed to Edit A Course, one of the tools in the Site Setup group is the 'Homepages' tool. Choose to create or edit a homepage belonging to the org unit in question. This let's you choose the page layout and place widgets within the layout packer. If your new widget has been made available to the org unit you're in, then you should see it as available when you choose to "Add Widgets" to the page.
Hope this helps.