You mean no title bar? That only is done for applications which support it. If you want maximal screen-estate I guess you just want to configure the fullscreen key. See System Settings→Keyboard→Shortcuts→Windows→Toggle fullscreen mode. There also is a standard hint that applications can set to indicate that they do not want a title bar, maybe wmctrl can set that manually or devils pie automatically. Lastly, check for a different metacity/mutter theme.
Out of all suggestions, I don't think too many people have used anything other than just fullscreen so you might run into issues.