It's somewhere a feature request, I want to have a symfony form, where in case of an error or after certain amount of failed form submission , I can show up a captcha field. I spent some time on it and tried to solve the problem, with form event listeners to add or remove this additional field, but I couldn't get it work.
If someone has an idea for this, then I would be glad to read it, if not then this would be a feature request.