You can use your keyboard to quickly accomplish tasks in Decloner. To find the shortcuts for common commands, look to the right of each command in the menus (or see the menu shortcuts below). To complete an action, press the shortcut keys indicated below.

Main shortcuts
Add a folder or an iPhoto/Aperture library to the list of locations to scan for duplicates ⌘O
Remove a folder from the list of folders to scan for duplicates
Scan the chosen locations for duplicates ⌘⏎
Display the staging area ⌘T
List of scan locations
Move scan location up ⌘⌥↑
Move scan location down ⌘⌥↓
Remove scan location from the list
List of duplicates
Reveal the selected file in Finder
QuickLook at the selected file ⌘Y or Space bar
Mark/unmark selected file for deletion ⌘M
Expand all duplicate groups ⌘→
Collapse all duplicate groups ⌘←
Autoselect duplicates ⇧⌘A
Deselect all files ⌘D
Stage the highlighted file or group for removal
Stage all selected files for removal ⌘⌫