Why doesn't it list LDAP? Is it because LDAP is not an interactive enrolment method? If so, shouldn't this settings field be something like "Interactive Enrolment Plugins" instead of "Enrolment Plugins"?
I don't want to be picky, but the text above the enrolment plugins configuration table reads (emphasis is from original text):
"..., and one plugin can be set as the default plugin for interactive enrolment."
All of them are enrolmente plugins. Some of them are interactive enrolment plugins. So if a plugin is not available for interactive enrolment (the plugin itselfs dictates this), you can't choose it as the default. Seem pretty clear for me