If you are a Mac user, use the CMD key instead of CTRL

There are some hotkeys, what you can use in your Slide editor.

Key Event
Ctrl + Z Undo
Ctrl + SHIFT + Z Redo
Space Play/pause timeline
Esc Stop timeline
Del Delete layer
End Duplicate layer
Arrows Move layer 1px further (Canvas mode only)
Arrows + SHIFT Move layer 10px further (Canvas mode only)
Numeric keypad numbers Align the layer (Canvas mode only)
Numeric keypad numbers pressed twice Align the layer + move it into that align position (Canvas mode only)
Pushing Ctrl while moving the layer Turn off vertical snap (Canvas mode only)
Pushing Alt while moving the layer Turn off horizontal snap (Canvas mode only)
Ctrl + click on a device Paste the active device's layout to the clicked device's layout
Ctrl + click on slide editor's align options Choose a default aligning for the layers you will put down afterwards
A Give "auto" value to the width and height of the selected layer
SHIFT + Padding or margin modification with cursor Opposite padding or margin will change too (Content mode only)
Smart Slider 3.0 video about hotkeys (but you can use the same keys in SS3.1+)