My almost 9 year old child is 48.5 inches tall. When she started playing pieces requiring a pedal about a year ago, I asked her instructor about the possibility of using a pedal extender with 2 pedals: http://www.cpsimports.com/foot_pedal_stool.html
Her instructor didn't seem very impressed with the idea - I think mostly because he is very particular about pedaling technique and perhaps feels the use of an extender would interfere with this. My daughter is still resistant to the idea.
A few other instructors observed her playing the piano last week. Although I didn't bring up the pedal extender subject, almost all of them recommended that she start using one in order to reduce the chances of injury. Some felt she would immediately improve her playing by using one, too.
I don't think my daughter will be able to play the piano without her elbows below the keyboard, forearms parallel to the floor, shoulders relaxed, etc., without accessories for at least another 2 years. She does play at least 90 minutes almost every day.
Should we be concerned about injury without the use of a pedal extender?
Should we be concerned about compromising pedaling technique with the use of a pedal extender?
I'm also looking for URLs or books about this.