remove checkbox for show_opt_in?

[ajboni]

Hello, is it possible to remove the checkbox functionality from show_opt_in option?

I think it might be related to #980 and #998.
I need to load data with "some" properties filled, but let the user fill the rest.
Those fields are not "required" and should not include a checkbox to enable/disable.
With no required_by_default or show_opt_in fields with no data in startval are not shown for editing.