Close voiced Chords

An idea to play chords which would be otherwise impossible (at least for me) to play.

Use one finger of you picking hand to fret additional notes, while using the other fingers to pluck the string like you would normally! This enables you to play, for instance, two major second intervalls in one chord.
Watch for an example:

This way you can also play scale, while having the notes ring into each other (see end of the video).
Cheers