Permissions to "move issue" not granular enough.
Problem to solve
Currently, people cannot move their own issues unless they have "reporter" access to the project the issue belongs to. However, reporter access grants permission to move ANY issue, not limited to their own.
Proposal
Make "guests" able to move issues they created, as long as they have permission to create issues on the project it's being moved to. They already have permission to close their own issue, and since moving is nothing more than closing and reopening in a different location, this should be fine as far as I understand.