additional param in tags

[Troy Hall]

Anyone know exactly how to add a additional field in global tag params?
I've tried copying the tag default.xml and modifying but that kills the
layout override completely.
Bear

[Walt Sorensen aka photodude]

use a plugin (until 3.7 when you get custom fields...)

https://docs.joomla.org/Adding_custom_fields_to_core_components_using_a_plugin