Technically I believe it’s the Hue API that recycles the scenes. It’s just the way Hue set it up because the bulbs can only hold so many scenes. @CyrilPeponnet just pulls them in from Hue.
This type of app is not too tough to build, but it’s hard to make it user friendly. That’s a lot to input for a user and most of the values won’t mean anything to a user. I haven’t done much with scenes because of this. That said, it has been tackled in various forms.
Here’s one based on triggering scenes from a button controller that could be adapted to use virtual momentary buttons instead:
There’s also this great scene app that grabs the current state of the selected devices and stores it as a scene that can be recalled. That way you can fine tune the colors/dim levels in the environment, then easily recreate it.