I'm using the latest AIR 13 release from 4/8/14, and "-useLegacyAOT no" still doesn't work with my app.
I've isolated a case where the packager fails to generate correct code, and have put together a minimal test case that demonstrates the problem.
If an Adobe person will respond here or via private message with an email or FTP so I can get you my code, I'll send it over.