I have three feature requests
Updating an existing scene, now it is only possible to create a new scene to have a light set differently, this also mean updating switches and schedules.
Copy light settings to a different light, now it is quite hard to match exact color/brightness settings of a light
Copying settings of friends of hue switches. When you have many switches it is quite time consuming to setup the switches, it would be very helpful to copy the settings of an other switch and only make small adjustments.