Here is an idea for you.
Look at the picture I have attached. I made a little backet that fit on the PCOOL outlet tube that would allow me to apply air either via a foot pedal. You could make a similar bracket with a couple more tubes or even a manifold with several loc line nozzles outputting coolant. You could feed coolant to the manifold from the same input line that is feeding the PCOOL mechanism. This way you will still get the positioning of the PCOOL system but with more volume (multiple nozzles) and even have the ability to get a little more directional control of the output coolant. Loc Line also has in line shut off valves that can give your even greater control of the volume of each nozzle.
I haven't checked but you may be limited to the size of the cooper tubing you can attach to the PCOOL due to the internal bore where the coolant passes through the PCOOL mechanism.
You could bypass the PCOOL unit entirely as far as coolant feed is concerned. Just attach a custom made manifold to the PCOOL Copper Nozzle and feed it from the coolant pump output that originally feed the PCOOL Nozzle. You could size the nozzle(s) to vary the output of coolant.
I have also made a programmable Air Nozzle that can be utilized in place of the PCOOL Coolant outlet. It utilizes the PCOOL unit for positioning the airflow for each tool and is even programmable for the interval and duration of the air blasts. I have a switch that is mounted on the HAAS control where I can switch to either Air or Coolant. I could also set it up where both the air and coolant operate together. Endless possibilities.
"http://www.youtube.com/watch?v=B1ArxUjLy5c"]YouTube - Programable Coolant Air Solenoid Introduction
Just some thoughts that may be of help.