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There's no particular reason why this feature shouldn't be added, but I won't have time to look at adding it myself for at least a month. If you'd like to write up a patch that adds this feature, I'd be happy to take a look at it.

Otherwise, if this is for just one project, you could add the source code for your project (e.g. as an appendix) by using "--latex" to generate the latex output, and then editing the latex files to include the listings you want. Of course, this wouldn't give you any reference links between the API docs and the source code (unless you added those by hand as well).