It would be nice to be able to edit environment variables in bulk. I often have the key/value pairs already somewhere else, but then manually re-entering them into Render can be a hassle. I'm imagining a 'bulk editing mode' where it just shows you one big textarea with all the ENV vars like so:
FOO_BAR=123
STRIPE_SECRET=4092142
When you save it, it just parses that for you into separate env vars. It would be really nice for power users.