Squid non transparent - User permission question

[vulcassio]

Hello.

I'm setting up an environment on my pfSense with a non transparent proxy, its working perfectly.
I want to upgrade this service to authentication method, the user must log on the proxy to use it, but I have some questions regarding this method:

1. Is possible to give permissions to different users not involving LDAP? If yes, how?
2. Is possible to create a generic user? This user would be used by most users, that has common permission, and some special users like admin and others would be more permissions?

My squid version is 2.7.9 pkg v.4.3.4
I appreciate any help given to me about this topic.

Thanks.