Support Fastest way start sending SMS?

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http://androidforums.com – I jsut recently upgraded from the original Droid Incredible to the GS3. On the Dinc, there was a Search softkey external button that I can assign to bring up Quick Compose on Handcent and send a SMS to a contact. This was very quick and efficient since I send a lot of texts. However, the GS3 obviously lacks this Search key. Is there anyway I can program a long press of the Back key on the GS3 to bring up Handcent's Quick Compose? Would I have to root the phone? If so, should i wait until 4.1 jelly Bean comes out? If this is not possible, is there another SMS app I can use that will allo (General)