Hi dplatzman,
As of now, filing a Nevada Modified Tax Returns within QuickBooks Online is still unavailable. That said, I'll send feedback to our Developers team so they can check this feature suggestion again.
In the meantime, you can visit our Feedback page to know the latest and updated ideas in QuickBooks: Customer Feedback.
Also, if you have some How do I concerns,, feel free to drop by our Help Articles page.
I'll be around whenever help is needed. Stay safe!