Just went from a non integrated flexicoil sprayer to an Envisio Pro.  
Very frustrated trying to change rates on the go and switching between auto rate and manual mode.  Tiny buttons non tactile buttons on the screen, and having to press at least 2 buttons to get to manual mode isn't convenient in a hurry.
Currently doing preseed glyphosate and we do vary the rate constantly do deal with quackgrass patches vs annual weeds.  And for corners, rough patches etc.  

Does the raven switch pro have any way to switch between auto and manual rate?  Or just rate increase decrease and boom section on off.

How hard would it be to program our own switchbox to communicate with the Raven system?