Hello,
I had found this code that was a bit older but claimed to do what I wanted:
Essentially, I want one of my form fields to be able to inject a taxonomy term into a specific taxonomy.
Actually, what I'd REALLY love is a field that does 2 things..... Uses some sort of auto-complete to query all the current terms for a specific taxonomy and give those as suggestions for the field.... if then the term doesn't exist, it add the new term... but I'm sure that's a much larger request ;)