lmtp_tls_wrappermode

[David Mandelberg]

Hi,

I was looking for a way to use implicit TLS with LMTP, similar to 
`smtp_tls_wrappermode = yes`. I don't see any mention of 
lmtp_tls_wrappermode in http://www.postfix.org/postconf.5.html but 
https://github.com/vdukhovni/postfix/blob/f246147ec54bb2b79ac84522d1d1a6c2b1664bd6/postfix/src/global/mail_params.h#L1450 
has it and `postconf -d lmtp_tls_wrappermode` shows it.

Is lmtp_tls_wrappermode safe to use even though it's not documented? 
Should it be documented?