Here is another common A7 chord shape which requires the use of the first finger across the 2nd, 3rd and 4th strings. This technique is common in all styles of guitar playing and is called a half bar. Use it to play the A7 chords in the following example. Notice the alternation between chords and single note runs. This is also common in many styles.
Here is an F minor chord shape which requires the use of the half bar. Practice playing it both as a full chord and an arpeggio until you can sound all the notes clearly and then use it to play the following example.