Feature Request: Port location

As a user of RapidMiner, I would like the option to determine the location of the ports for an operator.  Today, the inputs are on the left, and the outputs are on the right.  I would like an option to change the inputs from the left to the top, with the outputs changing from the right to the bottom. 

I expect this to be an option that is included as part of the right-click menu list.

This feature would allow us to more cleanly stack our process vertically.  

Mockup: