Enable cursor keys in Shot Manager

[jamesw]

In the next Mac update, the left and right arrow keys can be used to change the selection in the shot sequencer, with scrolling to keep the latest selected shot visible.

I'm not sure about the Enter key. If you select an item in the outline area in the upper left, the Enter key makes the name of the shot editable. That's pretty much a Mac standard behavior, as in the Finder.