Although the Street Lights styles don’t include this parameter by default, you can set the distance directly in the Linear1S Generator, or right-click on it, choose Export Parameters, and check the Evenly > Evenly Distance option. Once done, you can wire a Numeric Parameter to control it. You can adjust the Curbs style in a similar way to better suit your needs.
Thank you very much for your feedback — it's greatly appreciated and will help us improve these styles in future releases.
Best regards,