Entering newlines in edit_fields and custom metadata tagsets

I finally discovered how to allow the user to enter newlines directly into edit_fields without having to type CTRL+J:

f:edit_field {height_in_lines = 5, allow_newlines = true}

Similarly, in custom metadata tagsets, you can duplicate the functionality of the "Large Caption" preset:

{'com.adobe.caption', height_in_lines = 15, allow_newlines = true,         topLabel = true}

This undocumented feature hasn't been posted in these forums (according to Google), but after the fact I see that a number of others discovered this years ago, at least with respect to metadata tagsets:

http://regex.info/Lightroom/Meta/JustPeek=Jeffrey/Jeffrey

Customising Adobe Lightroom metadata field names | Malc Raggett's Photo Blog

Happy Amateur: Lightroom 5 Metadata Tag Set