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I am not sure if the scope is intentionally limited only to QOS, but just to make sure you are aware about all available functionality, below some more details.

Via `rbd config pool|image` you can set not only QOS but much more. `rbd config pool ls $pool` and `rbd config image ls $pool/$image` will return the full list of possible overrides. E.g. for QOS we have these options:

% rbd config pool ls rbd |grep qos
rbd_qos_bps_limit                      0        config 
rbd_qos_iops_limit                     0        config 
rbd_qos_read_bps_limit                 0        config 
rbd_qos_read_iops_limit                0        config 
rbd_qos_write_bps_limit                0        config 
rbd_qos_write_iops_limit               0        config 

So probably we want some more generic, not only QOS?

And the dashboard can use python rbd bindings:

params = rbd.config_list(ioctx)
rbd.pool_metadata_set(ioctx, "conf_rbd_qos_bps_limit", "100")
rbd.pool_metadata_remove(ioctx, "conf_rbd_qos_bps_limit")

params = image.config_list()
image.metadata_set("conf_rbd_qos_bps_limit", "100")
image.metadata_remove("conf_rbd_qos_bps_limit")

Note, the overrides are stored in the pool/image metadata, and for set/remove we use "metadata" API, which requires the config keys to be prefixed with "conf_".