Several ship functions, such as shield hardening, are not bindable and therefore unusable for joystick users. Can we expect key binds to be added for these functions in the future?

I think yes. Sorry, it's a really short answer, but anything that is just a simple click and that makes sense, so if that function would actually be easily reachable for a pilot or be somewhere on a HOTAS, then we would offer a key bind for it. I know that there's a couple of things left there, but I think ultimately we will be adding those.