This page demonstrates the Restrict Shuttle Values plug-in.
This dynamic action plug-in can be used to restrict the list of values in the left shuttle pane. The chosen values in the right pane are not affected. The selection is case insensitive and looks for the occurrence of the seperate search strings. Enter 'e n' to select all values containing 'E' and 'N'.
The plug-in that can be downloaded from the plug-ins section of
The plug-in function both for Apex 5.0 and 5.1.

More information is found on this blogpost.

Demo Restrict Shuttle plug-in