I’ve added a sublime-commands file to the plugin (thanks quodlibet!) so you should see this show up if you update through the package manager.
Incidentally, my mnemonic is something like this:
• arrows move
• shift + arrows move, but bring the file with (“shift” holds on to the file)
• cmd+arrows make a pane
• shift+cmd+arrows destroy a pane (“shift” swaps it up)
• option+arrows clones (“option” is the standard for copying, like in an option-drag)