Gmail – Any plugin to control GMail message editor with keyboard

Use the down arrow to select the auto complete you want then press TAB.

This will populate the search box with the selected auto complete item, add a space and position the cursor after the space without executing the search. You can then continue to add search terms, using the down arrow and TAB where more auto complete suggestions are applicable.

Only when you've finished with your search terms, hit ENTER.

I am able to use the following shortcuts:

• Indent: Command + }
• Outdent: Command + { or Enter