dmtt,
I agree that there should be such an option. According to
https://www.ftb.ca.gov/tax-pros/law/legal-rulings/2011-02.pdf
and
https://www.ftb.ca.gov/forms/2021/2021-1005-publication.pdf
the CA taxability of NQDC is determined by whether or not it is taken out over 10 years or more.
I do not have a workaround for TurboTax online that I can suggest. The desktop versions allow direct access to the forms and generally allow you to override entries. While there is a way to transfer from online to desktop, I haven't yet activated my desktop CA state option to check of that workaround works. I'll let you know.
In the meantime I I will raise this issue with the powers that be. Hopefully they can either fix TurboTax or find a workaround for you.
