Registration form customization

Linked to others proposals we submitted lately is another request from our client which deals with the customization of the registration form. The aim through this feature is to collect data enabling him to improve his evaluation of his actions for his users. Data would be age, gender and others as already written in this proposal (https://meta.decidim.org/processes/roadmap/f/122/proposals/14381). Obviously this is a sensitive matter regarding Decidim’s social contract. We thought about making the registration form customizable by the admin from the back office. The responsibility of collecting the data being his, the admin would have to justify in terms and conditions the collection of additional personal data.