Ability to set user filtering in "Raise this request on behalf of"

Implementation of New Features Policy

At the moment, we can't set an ETA for this feature to be released, since there's a number of factors that determine how our product team prioritizes new features.
You can learn more by reading Implementation of New Features Policy.

Problem Definition

Project admin cannot filter the users listed in Raise this request on behalf of.

Suggested Solution

Provide an option to limit the users listed there like the user picker of the Custom Field.

Workaround

None. Consider adding yourself as a watcher to be kept informed as to the state of this feature request moving forward. With that way, if our development team updates the ticket, you'll be notified via email.