Background, shadow and corners of window

[c-sanchez]

Currently freeshooter take active window filling the corners with the current desktop background or using a black color if we have Clear window background (vista +) option disabled
But is not possible take an image of the current window with an transparent background, making the window corners "rounded".
Also can be nice take the active window with the window shadow.
So looks currently an image taked of the active window with freeshooter

Now how looks with the transparent background, taked with other program

Taked same image with the transparent background and window shadow

This are the related options in the other program