Tickbox to Enable or Disable environmental variables?

[5p4r74cu5]

Hey everyone :-) I would like to have a little tickbox next to each environmental variable so I can enable or disable the variable without having to delete it entirely. It's a minor feature, but would certainly assist with troubleshooting games that are on the trickier side to get running properly, and even for some basic things like enabling and disabling HUDs, etc.