Any way to increase the rate of key press output?

Hello! I am trying to use my Morph to help control such things as brush size in ZBrush or Photoshop. The only way I have at the moment to get input in ZBrush is via two key shortcuts for increasing and decreasing size. I can set a slider on the Morph to output these key presses as I slide up or down, but I would like it to generate those presses faster if possible. Any way to do it? Thank you!