Base64 encoding project.newDocument?

Hello,

I am trying to put files in a project using project.newDocument method. With
text files it works just fine & straight; anyway since I need to upload .pdf
files (to integrate OGo with Hylafax) I'm finding a big limitation in the
absence of a base64 encoding parameter in that method.
I saw project.loadDocument supports it; but this means that via xml-rpc I can
just download binary files, and not upload them.
Are there specific reasons for this absence is it possible have some kind of
turn-around?

Thanks, Luca.
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