Is there any reason for option "move_bug_threshold" to be only valid for "all projects"?

Currently we are checking: user has access level (for bug) defined by this option, AND, user can report bugs in target project.

if( access_has_bug_level( config_get( 'move_bug_threshold' ), $t_bug_id ) &&

access_has_project_level( config_get( 'report_bug_threshold', null, null, $f_project_id ), $f_project_id ) )

Seems like with these checks, the option could work fine on per-project configuration.