[Feature Request] Firegestures Zoom Image?

[momoe]

I'm moving away from All-in-one Gestures, and found Firegestures to be an equitable replacement.

One feature I used to be able to do is to start a gestures (right_up_left_down) would double the image size when I do the gesture over it and half the size with the opposite (left_up_right_down) gesture.

I would love to see this gesture fit into Firegestures please.

-Momoe