1. A lot of websites servicing online dictionaries have pronunciation function by flash or something.
In GD those flashes play but without sounds.
2. Most online Chinese dictionaries have a panel for handwriting characters simulating pen mouse.
(As Chinese language has tens of thousands of characters, keyboard inputting is sometimes very tricky).
This function also doesn't work in GD.
[example site] http://www.nciku.com/
Since GD is not a standard browser, it is quite natural that it cannot display all the web contents.
I don't know anything about progamming so can't imagine how complex it will be to make those functions enabled in GD.
But I think it is worth trying it, isn't it?