allow setting up brightness slider device per monitor

i saw in the config you can change brightness with
`dms ipc call brightness increment 5 ""`
`dms ipc call brightness decrement 5 ""`

currently, there is a brightness slider allows changing the brightness for one device, but lets say i have two monitors, so if i pick one of them, it would pick that device for all of them, meaning if i want to change the brightness of my second monitor i would have to pick it up again. it would be nice if you could make that setting per monitor and not global like it is now. thank you