command for "Automatic Speed"

Time changes are not something I do All The Time at all. I don't know anyone who does all of their work in slow motion. Maybe you could process your footage before you edit?

You can save an effects preset and you might even be able to create a keyboard shortcut for it. I haven't created my own shortcuts since the early days of FCP7 so I don't know if Automatic time is accessible form the Command Editor.

1. Apply any combination of built-in effects and clip effects to a clip in the Timeline, and make any needed adjustments to the effects.
2. Select the clip in the Timeline.
3. Do one of the following:
   • Choose File > Save Video Effects Preset.
   • Open the Video inspector and click Save Effects Preset at the bottom of the inspector.
   The Save Video Effects Preset window appears, with any applied or adjusted effects selected in the Attributes list.
4. Enter a name for the new preset in the Name field.
5. Click the Category pop-up menu and choose an Effects Browser category in which to store the new preset.
6. In the Attributes list, select the video effects you want to include in the preset.
7. If you made any keyframe adjustments to the source clip, select either Maintain or Stretch to Fit.If you select Stretch to Fit, Final Cut Pro adjusts the keyframes in time to match the duration of any clip to which you apply the preset.
8. Click Save.The new video effects preset appears in the Effects Browser category you chose, ready to be applied to clips in the Timeline in the same way as any other video effect. To apply the preset to a clip, see Add effects to your project.

Keyboard shortcuts and Multi-Touch gestures overview

Final Cut Pro provides several ways to increase your efficiency while you put together your project:

• Standard keyboard shortcuts: Many common tasks, such as opening a specific window or adding a clip from the Browserto the Timeline, can be accomplished very quickly by pressing one or more keys. See Keyboard shortcuts.
• Multi-Touch gestures: If you have a Multi-Touch trackpad or mouse, you can take advantage of Multi-Touch gestures to quickly perform many tasks while creating your project. See Multi-Touch gestures.
• Custom keyboard shortcuts: You can add to the standard keyboard shortcuts by creating your own custom keyboard shortcuts for features that you use frequently, such as Color Board controls. Or if you’re more familiar with keyboard shortcuts from another application, you can use the Command Editor to substitute those keyboard shortcuts in place of the default set in Final Cut Pro. See View keyboard shortcuts in the Command Editor.

The Command Editor has an empty slot for Automatic Speed so, yes, you can assign any unused keyboard shortcut to the effect.

You can also select multiple clips in the timeline or in the timeline index and apply automatic speed to all of them at once.