I just discovered this amazing online script for LaTeX users that converts your hand-drawn symbol into the appropriate LaTeX command (it also tells you which package you need to load to have access to the command, which for many people, may be the more useful function). The character recognition is very accurate in most cases, especially for math symbols, but of course, the more training it receives, the better the results will be.
It’s clear that the IPA symbols haven’t been trained very much yet. I’ve already noticed improvement just from my own limited training on ɒ, which wasn’t on the short list at all the first time I tried it, and now frequently appears as the number one choice after a few trainings. So pick your favorite IPA symbols and get to work!