To improve flexibility for people using this module, it would be good to allow the option to disable some of the features this module provides (although probably not recommended).
For example, one could choose to disable the HTML5 validation that is added to all forms, and selectively decide which forms can have HTML5 validation (e.g. Webform module already provides a toggle for this - which is overridden by this module).
Provide a configuration schema and settings page to select which features to enable (defaults to everything enabled).
Create a MR with this functionality
An extra settings page would be added. No other UI changes needed.
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Active
2.1
Code (other)
I created a MR to add this functionality.
For the selectable prefill attributes for form elements I didn't add an option, as this needs to be configured per field widget manually anyway, AFAIK.
Attached is also a patch version of the MR changes, for Composer based workflows.