It would be really nice to see some implementation of an option to clear global variables with wild card in the Set Variable scripts step.
Such an option would allow to remove the value from all Global Variables in the form of something like $$option where the option might be a check box to clear all global variables that have $$option as the start of the variable name. This would clear $$optionA, $$optionB, $$optionC and so on.
It is an extremely time consuming and error prone task to manage clearing global various that use a standard naming convention. This could clear global variable values with one step.