Location: Server Configuration > Input Fields > Custom > Input Type
Input Types: number, date, time, datetime-local, etc. All of which degrade gracefully to text on systems that do not support the new types.
Would be nice to have "required" and/or "pattern" that adds said properties to the generated HTML fields. Thereby allowing intermediate browser validation prior to form submission.
Note: If the new input types are considered, change email/phone from text to email/tel as well ;)