Thanks for the constructive feedback.

1. I'll keep thinking how to improve the interface selection to simplify the first-time setup. It's a bit lower on my priority list, but the suggestions are valid.
2. I'm trying to balance configurability and ease of use and so far the current input is OKAY - it limited the number of wrong setups significantly and it still gives options to include additional arguments. But fair point of having more robust input validation. In general, the initial configuration UX, although very important, is less important than day-to-day tasks so I prioritize accordingly. Still, there is lots of to improve and if this was something that made me money I'd be able to spend more time on the niceties - I'm really focused on the core functionality at this point with approx a 80/20 time investment split.
3. I didn't have any feedback on the workflow yet, but I'll keep this in mind to make it more user-friendly. Once you select the devices they are pre-populated in the grey area so I didn't get any feedback of it being counter-intuitive.

Still it's weird you had issues on FF as I use it as my main driver. 🤔

Thanks again for the feedback and if you can, please submit an issue for quick UX improvements here-and-there. Again, trying to balance where I spend my time to improve the app 😉