missing --brightness features

i use --scale a lot, like xrandr --output DVI-D-1 --primary --mode 1920x1080 --scale .833333x.833333 --pos 0x50 --rotate normal --output VGA-1 --mode 1440x900 --scale 1.11111x1.11111 --pos 1600x0 --rotate normal , and --brightness like xrandr -s 960x540 && xrandr --output eDP1 --scale 1x1 --brightness .7 - they are missing a lot on ARandR...

(as option, from ARandR, would be great if we could get --scale calculated from the desired resolution, like entering logical 1600x900 resolution on a physical 1920x1000, that --scale .833333x.833333 could get automatically calculated, without we having to calculate it ourselves)

[edit: Changed title, moving the --scale part out of the title, as this is reporting two items and one is already in #2]