Video Editor - Clip Extend Mode

Currently when a clip in the Video Editor is extended beyond its length, the last (or first) frame is repeated over each subsequent frame.

Would it be possible to define an "Extend" mode for movie and image sequence clips that enables the following:

"End Frame" Current functionality. The final frame of the sequence is repeated in each subsequent frame. [{1,2,3,4,5,6,7,8,9}9,9,9,9,9,9]

"Loop" Extended clip uses frames from the beginning of the sequence as needed. [{1,2,3,4,5,6,7,8,9}1,2,3,4,5,6]

"Yo-yo" Extended clip uses frames backwards from the end of the sequence, then forward from the beginning as needed. [{1,2,3,4,5}4,3,2,1,2,3,4]

Extending the beginning would have a similar effect:

"End Frame" (Repeat first frame) [1,1,1,1,1{1,2,3,4,5}]

"Loop" (Loop frames from end as needed) [4,5,6,7{1,2,3,4,5,6,7}]

"Yo-yo" (Loop frames from start, then end as needed) [3,4,5,4,3,2{1,2,3,4,5}]