In SimsUshare we have a feature called “Tap Regions” to accomplish the same purpose -- this is useful if you want to hide from your viewers which arrow you are pressing. You might want to hide where you are going if you have locations setup for different conditions, and you don't want your students to see which direction arrow you have assigned to the various conditions.
Tap Regions are only active when the navigation cluster is hidden manually using the diagonal down-pointing icon on the bottom left of the screen. Once the cluster is hidden, you can use the menu item “Show Tap Regions” to remind you momentarily (it displays then fades away) of the screen regions:
On Windows/Mac, SimsUshare also has keyboard shortcuts available for activating the