The configuration is very handy but is there any way to change the configuration before used to create form or list. I need to change some config options depending on user type. One option is to create separate config file per user type just for a single value (eg. recordOnClick in list view where for one type I want to show preview page and for another user type I want to show edit page, defaultRedirect in forms etc).

https://octobercms.com/docs/api/backend/form/extendfieldsbefore

And for lists https://octobercms.com/docs/api/backend/list/extendcolumns

Awesome. Instead of event I have used

public function listExtendColumns($widget) {
...
}

This is more suitable for single controller and personal plugin. :)