Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
You are both right.
Indeed, the runner does not handle options passed in the "OpenOCD Options" field.
A fix has been found, it will be integrated as soon as possible.