Pin codes additional to otp codes for more security

[kuznetcoff777--- via OATH Toolkit general discussions]

Hi everyone! 
"The file format is documented here: 
http://code.google.com/p/mod-authn-otp/wiki/UsersFile"; - the file format for 
/etc/users.oath is described, I read about pin there (When a user has a PIN, it 
must precede the one-time password in the HTTP password field. For example, if 
a user has PIN "1234" and the token generates the one-time password of 
"567890", then the user must enter "1234567890" as their password for HTTP 
authentication.), but it turns out there is no support for it in this module, 
it is in mod_authn_otp is an Apache web server module for two-factor 
authentication using one-time passwords (OTP) generated via the HOTP/OATH 
algorithm defined in RFC 4226.
Is it possible to add additional pin codes? I think it will add more security:
1-otp codes even if stolen, pin code necessary to be stolen
2-pin codes can be long enough and can have 4 kinds of complexity and stored 
not as plain text (like httpasswd format as in apache otp module)