Thanks. I do know the proper way to solve this problem already though. My undergraduate degree is electrical engineering and I my graduate work is in a field called Digital Signal Processing. I did not implement a more complicated streaming solution because I don't want to load the iPhone down, this is just to control a program that does something else - and currently I only need to enter two sequential characters for all control options, although I have decoded sentences with my current Morse Code decoder.
If I were to implement a full streaming solution, I'd create a separate processing thread to decode the Morse code (or up and down button events with times). The UI would write the up and down events to a thread-safe queue, and the decoder thread would read from that queue. The decode would write characters to a thread-safe output queue, which would be read by the UI thread.
This would allow decoding while doing other processing. Perhaps I'll implement that someday.
Currently there is no point in doing a dynamic adaptation to sending speed variations when I am only decoding very short blocks - currently only two characters.
I did find that podcast interesting and entertaining though. Also, I had purchased the "Natural Language" Python book he mentioned over a year ago. It's a great book. The best part of that book is that it provides sources to various online resources, including a word corpus.