The 2000 item selection. Is it for you only or is it acceptable for all users to see?
You could add an empty csv file to be loaded with the application, but when you need to flag a collection of values you add them to the csv and the script flags them during the next reload. This approach can be adjusted to fit your needs, but the flag you put into the app will by default be available for all users to select.
Plees ekskuse my Swenglish and or Norweglish spelling misstakes