R Stewart Images
Please clarify your post. Are you asking how to do a split screen effect in Premiere Elements 11 (presumed for now on Windows 7 or 8 64 bit). Or, are you commenting about a feature request for the Adobe design? From what you have written it appears to be the latter.
If this is a feature request for future versions, then you might want to follow up by filing an Adobe Feature Request/Bug Report Form
That is where you can have your voice heard.