They do have a software like this, actually it is a service, you call it and give the number to send to and say what you want to text and off it goes. Ive never tried it but it is out there.
Service through Sprint like Voice Command? VC is cool, but I never use it. Go figure that I'm too lazy to hit *+TALK and just say who I want to call.
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I used to always text and drive when I had my A900. I could do it without looking. That changed when I got my mogul and touch tho. I use Resco Keyboard Pro and it's not as easy but it's not that hard either