know your not interested in my input ,but recently did study on doubles and use of redouble; let me preface by saying a redouble is what you and your partner agree on as opener/responder:

1.redouble by responder[suggested use by several authors] 10+hcp no support for opening bid[suit] SOS

2.redouble by opener is to play

after reading about the suggested use of redouble and coming to understand it better,think it does have a place.