Mouse isn't locked into the window, which causes some strangeness. Weird bindings. Given how many vehicle demos you make, i feel like you should just have a premade rebindings menu you can paste into any of your projects by now that would solve 90% of the complaining, it's pretty easy to set things like that up once and reuse forever.
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If I was ever to make my own rebinding screen, there's a lot of features I want to add to it because rebinding screens are something I feel very strongly about, but it would probably take me months to make one good enough. Maybe one of these days I'll do it. In real life though, any sufficiently complex game would just be using Rewired which comes with a rebinding screen.