Radicle is a full-fledge (fledling of a) programming language, so you can really do as you wish with access control. Here's the module for authorization [0], and in this module [1] you can see an example of it being used.

[0] https://github.com/radicle-dev/radicle/blob/master/rad/prelu... [1] https://github.com/radicle-dev/radicle/blob/master/rad/monad...