It might look like this
or this

I am using FastStone Capture and yes, it is not free. But there might be other free programms that offer similar results.
I just think it should not be the developers priority, there is no need to reinvent the wheel as there is such a mass of tools at our fingertips to do exactly this.
You got some of them already if you got Windows installed. One is called the "Print Screen" key, the other is the program "Paint". I just dont like it's handling.

