Second that! Get with it and release an app for the FireTV stick. The last sticking point for me to be a return TV (streaming) subcriber!
The bluetooth mouse I got on the bay works with debugging off. It had to be on to move the spectrum app from my tablet to the stick, but once loaded, I could turn it back off. I would think you could also use a bluetooth keyboard instead of mouse, but didn't try it since the mouse worked fine and is physically a lot smaller.
Then you did not follow the instructions. You load it to your tablet or Phone first, open the app and sign in and make sure it works. You DON'T sign out, you leave it so it logs on automatically on the device, THEN use apps2fire to transfer that app to the stick. Once there and opened, it should be logged on there too. Turn off the debugging and other option. The "screen" is squished to the top of the screen and the guide below. Use mouse to get a channel by scrolling down the list and pickng one. It will then go to full screen and increase resolution.