Hi Josh,
Sorry, I check the forum only infrequently these days.
Thanks for writing up your progress here.
Could we have a contributor to the wiki update the docs
That's you! Everyone can contribute to the wiki! See this "Participate!" page for how to get an account:
http://www.arduino.cc/playground/Main/Participate
For now, I added a pointer here from the 4-bit LCD wiki page, under the title working with interrupts. You'll know best yourself where else the information should be placed.