TYPO3 Core

Hello EXT:form Team,

I just try to build a form to allow creating/updating events2 records in frontend context. Nearly the whole day I have the documentation open on a second tab and try to find necessary parts.

First of all, I'm missing a part describing "renderables". It seems that I can use this configuration recursively.

The finishers were explained here (Integrator):
https://docs.typo3.org/c/typo3/cms-form/main/en-us/I/Concepts/Finishers/Index.html
But the finisher options are explained in developer context here:
https://docs.typo3.org/c/typo3/cms-form/main/en-us/D/FinisherOptions/Index.html

If I want to create a new RadioButton in YAML file I only find following in documentation:
https://docs.typo3.org/c/typo3/cms-form/main/en-us/I/Config/proto/formElements/formElementTypes/RadioButton.html
But that seems to be a form definition for formEditor rather than a list of possible options how to attach a new element of type RadioButton to the form.

I don't understand this example here:
https://docs.typo3.org/c/typo3/cms-form/main/en-us/I/Concepts/Finishers/Index.html#savetodatabase-finisher
The column "uid_local" is configured with "0". How could that work? A reference with an empty image?

I need an additional extension path and found following:
https://docs.typo3.org/c/typo3/cms-form/main/en-us/I/Config/persistenceManager/Index.html?highlight=allowedextensionpaths#allowedextensionpaths
The example does not work. I have added it as described on root node. But it has to be a sub section of TYPO3/CMS/Form.

Nice greetings

Stefan