Multiple User Select ( Similar to Post / Topic )

Hi ,

Currently If we want to start Group PM , we would have to enter their names on recipients area with auto fill-in option, but if it can be filled with users selection option as implemented in ( Post or Topic ) it would be great,
this will be fast other thank typing or copy/pasting users , and can add extra benefits

is there any plugin or feature for this I am missing

Have you tried entering the group name as the recipient?