Can TGB do graphic masking? Can TGB do graphic mirror?

I am thinking of a lighting effect, which will be a round light on the game scene. Everything is in the black ground except which is in the light. I don't find releated API in TGB doc to do that, does anyone knows that?

I am also thinking of a mirror effect, to simulat the inverted reflection in water. But I've failed to find the way to do it in TGB.

Does TGB lack the ability to do that kind of things? If so, I have to switch Engine.

I love the high productivty of the TGB, but there're too many things made me hate TGB.

Firtst is the terrible document. The document is hard to read (not because of the content, just because the organization, why can we just use some simpler HTML or PDF? It's slow and hard to browse), and harder to search, and the worst is there're so many missed things. Many functions lack detailed explaination.

Second is so many bugs that TGB have.
Two examples:
1. Image won't update once added unless you delete the image in the project folder and add it again, what a silly way!
2. Linked image can't be used to make animation, so why should we use them?
I think many of you can point out more and more problems of TGB. And we don't know when will they been fixed.

Third is the limited functionality. Lacking the pixel manipulation routine made TGB just like a toy, it can only be used to develop some simple games. Lacking secondly rendering target made TGB incapable of making custom effects.

I am disappointed with the current states of TGB. Alghough it has a pretty easy to use editor and a decent scene implementation, but it still lack some important features and active support to make it a great product and fully release its big potential.