I got the queue to work. This is on an RB750 running bugfix v6.32.4.
This does not work, and only limits upload:
add max-limit=10100k/10100k name=queue1 target=ether2
This does work, and limits both upload and download correctly:
add max-limit=10100k/10100k name=queue1 target=ether2,0.0.0.0/0
If I check in WinBox, the queue now shows two targets. BUT, in the CLI, printing the queues and the configuration export only shows ether2. Is there something I'm missing here?