You can type phrases of many Pinyin keystrokes using three strokes per character. Type each character that requires fewer than three Pinyin-mode keystrokes by using the [ character as padding.
Type the phrase "dian zi gong ye bu zhong guo bei jing shi," which requires the keystrokes dijzi[gs[ye[bu[as[guobeijy[ui[ in accord with the Pinyin-mode keystroke map.
This entire phrase is reverse-video highlighted in the preedit area as you type: