Feature Request: Access List SRC List for Users and IP Services

please implement the option to select a defined address list for “User” and “IP > Services” sections
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What’s the problem with adding addresses directly into those fields, instead of using an address list?

Is better not mix users, services and firewall…

The problem is that sometimes you have dynamic address for a user, for instance.

thank you. that's one of the most important use-cases