It'll be much easier than coping the hex code each time in order to add Individual colors Wich is overtime very inefficient.

And at least it brings a huge Problem with it

”Individual color/temperatures can be set on the library tab, indeed there's a preview but you have to press preview each time, Select devices and if the Color isnt good you have to do it over and over again.

it's way easier with a button to add it on the fly ...

Picture below shows the room control setting, Wich has no Button to add custom colors.

Big advantage :

"you can select the color you like, on one hand it automatically sync with the lights so you don't need preview each time. And on the other hand a tap on the button that will likely open a menu with option for color/ color temperature, name and picture before you save it Or Just edit it afterwards)