Not to resurrect, but I've created a contrib module to utilise the Inline Entity Form module for this purpose. It's a bit rough and ready currently but hopefully a start.
I have an entityreference selector in a form and I would like to create a new one if one does not exist. inline entityreference already does this. Can i do this now, or would it be possible to either integrate IEF into webform, or to add similar functionality within webform module to enable this?
Closed: won't fix
5.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Not to resurrect, but I've created a contrib module to utilise the Inline Entity Form module for this purpose. It's a bit rough and ready currently but hopefully a start.