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Attached is my attempt at a patch for this functionality, along with some simple tests. This basically mirrors what's done in zipfile.py, searching backwards through the file until it finds the end-of-central-directory marker. It tries to be memory conscious by reading in small chunks.
Patch is against trunk; I've also tested it against 2.7 and it seems to work. Any chance of it being backported into 2.7?
Also wanted to mention a real-world usecase for this functionality. I want to digitally sign a frozen python program with appended zipfile, which involves appending the signature to the EXE. Simple to do if only zipimport would support appended comments.