I am all for the change and the EDD looks good to me, but I actually think this is a bug rather than an RFE and so may not actually need an EDD. The pbs_rstat man page says:
Reservations at a server other than the default server:
Specify the remote server's name using @remote_server.
For an advance reservation:
For a standing reservation:
Though I suppose one could read that second line both ways, either as an explicit declaration that you can use @remote_server by itself, OR as just a preface to the two scenarios that follow that include the sequence_number.