However, for manual testing / having it write curl commands for you / making JSON really easy to work with by hand, it's fantastic, and I've converted a few people at work to it. Developer is also very responsive and nice to work with on Twitter.
Edit: you can also write extensions in JS for it. Not quite as accessible as e.g. Atom, but still decently hackable: https://luckymarmot.com/paw/extensions/
Go Twins!
You can do a whole slew of functional tests and as a bonus you can use those same tests for monitoring if you want.
Are you planning to go more native with something like Atom's Electron platform?
And yes, native apps are coming soon! Atom's Electron is a strong contender. We are exploring all possible options. :)