Suggestions

1) Select one or more objects and duplicate them (like Illustrator)
Dragging the selected object while holding down the Alt key (Windows) or Option key (macOS) and releasing the click duplicates it. Also using the combination of the shift key, it is possible to move the object even by degrees or blocks of pixels.

For this one, Storyline uses the same shortcuts that work in other Windows-based applications.

Holding down Ctrl while dragging an object, even, multiple objects will duplicate.  Holding down Shift+Ctrl while dragging an object duplicates and maintains alignment.

Using the Ctrl + Arrow allows you to change from moving an object by Grid point to Pixel Point. This is how it works as long as your "Snap Objects to Grid" is selected in your Grids and Guides Settings.  If this is not selected, objects will move by Pixel Point with the arrow and Grid Point with Ctrl+arrow.