kadmin and enctype

Dear Colleagues,

"kadmin -l" by default creates principals with the following Keytypes:
aes256-cts-hmac-sha1-96(pw-salt), des3-cbc-sha1(pw-salt),
arcfour-hmac-md5(pw-salt).

How do I create a principal with the weak des-cbc-crc keytype? The
"add" command does not seem to support the specification of
encryption types. 

There is an option "allow_weak_crypto = true" for krb5.conf, but I
don't understand in which section it should be for "kadmin -l" to
honour it.

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
AS43859