There is a command line argument in 9.6 that you can pass a file with variable names and types and they will be added to the strategy - Look for “Using PAC Control’s Command-Line Interface Tool”. Prior to having this, I wrote an autohotkey script that will take a list of variables from a csv file and add them to the open strategy.
See Add Vars via Command Line Interface and Teamwork Strategies - #9 by philip
I do think it would be nice to be able to export all your variables to a csv, be able to edit them and re-import them built-in, maybe someday…