Backed as well. With a low amount for the time being, but they show some decent demo footage.
The mouse+keyboard thing isn't much of an issue imo. Even in Elite Dangerous, you can achieve as equal to better results with fixed weapons using M+K compared to a HOTAS. Once you've reconfigured the godawful default bindings, that is.
It's simply the interface that every PC gamer has available and it's very, very unwise to not include decent support for it out of the box unless you're a hardcore sim targeting people who are willing to spend some hundreds of dollars for input hardware first. You most likely aren't if you're targeting a free to play model.
Very much hope this gets through successfully, but they may have missed the space revival hype train. Seems they'd do better having the big Chris Roberst as headliner, than somebody who actually worked on the X-Wing games.

55 hours to go, nearly 2500 backers, $139,890.