I've just added the keep_informed tracker field (234) from tracker5 to the plugin tracker call in make-a-wish or file-a-bug wiki pages in dev.t.o
And I've had to grant perms to group registered to see the name and group members of group Registered in order to allow users to see the list of groups or members to choose from.
To me, this is needed to allow a more decentralized way to allow any users to report to any other user (power user, dev, etc) that they know of that wish or bug report, to allow drawing their attention more easily.
If it gets too much misuse, we can revert later on, I reckon, this perm to view member names.
HTH