It is best to complement your took kit with a side winder or
similar tool designed to quickly turn the peg. I have made a
jig to fit my cordless drill for this...but there are some
smaller battery operated power screw-and-drill drivers which
can be easily adapted to this. You might want one to expedite
your string changes even when non-emergency. here is one:

http://www.musiciansfriend.com/product/Planet-Waves-Pro-String-WinderCutter?sku=360253