I e-mailed Nero the same question.
Finally heard back from Nero support:
Dear Mr. Few,
thank you for your e-mail.
It is not possible to have the “normalize all audio
files” and the “no pause between tracks” prechecked by
default with any version of Nero.
Should you have any further queries, please do not
hesitate to contact us again.
So much for tech support.
Unless someone else has a workaround, I’ll keep checking the boxes manually.
I just hate getting halfway thru a CD burn & wonder, “Did I check those %$%^$#!! boxes?”