Thanks to everyone for the excellent feedback.
I do not dive with a redundant air source, but I have practiced emergency ascents in the pool a few times. That is exactly the type of skill (along with bouyancy, trim, mask drills, propulsion techniques, etc) that I would want to practice on a solo dive (shallow swim beach) because I wouldn't want to ask a new dive buddy from a LDS fun dive (my only diving right now) to waste their dive practicing fundamentals. When practicing these skills in the pool I was able to complete them all calmly and comfortably and with proper form, but I not only want to improve on them, but make sure that I stay in good practice with them all (especially emergency skills that may not be used frequently, but should still be in good practice). It seems to me that practicing this stuff would make the 'hard-wired' 'fight-or-flight' response a little easier to control.
Anyhow, don't get me wrong, I am not planning to go out and dive recklessly. I am just using the forum to explore ideas that come accross my rookie mind.
Its great to have the desire to practise skills. Is there any chance to go back to your instructor and ask to tag along for more pool time? The pool is a good place to practise a lot of these skills. Here we often have divers asking to join us at the pool where we are teaching classes. They come swim around the class on their own while we keep an eye on them while helping with the class. It works out great and they get good practise in.
Of course nothing beats open water training and you should practise these skills in open water too, but I would do so in the buddy format for now.