Over on WordPress.org there is a suggestion about a way to add extra theme headers. The suggestion is copied here:
Unfortunately Theme URI is not available via default get_theme_data(), which is probably for the best because I don't want to conflict with standard wordpress conventions.
http://wordpress.org/support/topic/plugin-theme-updater-adding-extra-theme-headers?replies=1
Over on WordPress.org there is a suggestion about a way to add extra theme headers. The suggestion is copied here:
Couldn't you do:
Then you can call: