When you are done editing, you do not have to scroll or click to summarize your edits, nor to Preview or Save the article.
You can jump to the Edit summary box by pressing the Tab ↹ key.
To preview the article, press Alt+⇧ Shift+p.
To save the article, press Alt+⇧ Shift+s or press ↵ Enter when the cursor is in the Edit summary box.
To see the changes you have made so far, press Alt+⇧ Shift+v.