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good looking out on suggesting Astro... Even if you are in GMail and select attach, it gives you the option of "Astro" or "Gallery"... just what I was looking for...I'm not sure if this works in any file manager, but at least in Astro, if you long press on a file, there's an option for send which will attach it to an email in Gmail.
For documents I'm using kingsoft office, love it overall but haven't figured out yet how to tune it to gmail. After reading the thread, accidentally tried gmail on opera mobile, and vouala! It works, it allows you to attach any file, just as you would on your desktop pc! Ofcourse it rather ugly looking, but I'm sure they are working on that