We already set VkApplicationInfo::applicationVersion to 1 for D3D8 / D3D9 games.
Changing anything there would break literally everything since drivers rely on DXVK actually reporting itself as well as app names properly, and I'm not exactly sure how else we're supposed to do that.
It's also displayed in the DXVK HUD.
Closing this as it has been answered and there isn't really anything for us to do here.
Nothing extracted yet.
I'm requesting this for mangohud. I was told to open an issue here first by @flightlessmango