The dual display thing technically already works, although I'm working on a helper app just for that.
I suppose I could output support for text lcd displays but I don't see much point in it. Unless you buy one so expensive that you might as well get a real lcd display, most text displays have three lines or less. This means you could only show three labels at a time. Even pacman has 4 labels (up,down,left,right). Even if you just did the button output thing, that would only be useful for games with 3 buttons or less. It could be argued that those games have such simple controls you don't really need the labels anyway.
Heh I hope you didn't pay 80 bucks for that module cause it's worth about 5.. 15 if you absolutely need usb.