To make the current filedisplay show only items that were modified within the last hour, you can use these commands:
The first tree lines are to be joined into one, I needed to break the command into separate lines for posting.
SelectEx SIMILARMETAJS="if (((new Date().valueOf()-new Date(item.modify).valueOf())/1000)<3600) return true;" DESELECTNOMATCH
Select NOPATTERN HIDEUNSEL
You need to install the SelectEx script add-in for the first command to work:
Toggling is another story, if you need help on this too, tell us.