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Yep Brett you can do exactly that with the vray dome light.
I do this all the time to take advantage of importance sampling with the vray dome light.
If you set it to invisible you will render over black and can use any sky you like in post. If you forgot to make it invisible the dome light turns up in your alpha i.e. you alpha will be pure white which can be very annoying so make it invisible.
No super gnu you do not need to still have a sky in the reflection override slot. If you make the light invisible it will still show up in reflections. If for some reason you don't want your dome light to turn up in reflections you can tick affect reflections off in the dome light options.
I do this all the time to take advantage of importance sampling with the vray dome light.
If you set it to invisible you will render over black and can use any sky you like in post. If you forgot to make it invisible the dome light turns up in your alpha i.e. you alpha will be pure white which can be very annoying so make it invisible.
No super gnu you do not need to still have a sky in the reflection override slot. If you make the light invisible it will still show up in reflections. If for some reason you don't want your dome light to turn up in reflections you can tick affect reflections off in the dome light options.
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