Currently if I'm creating Customized Effects, I have to base them on an existing stock Predefined Effect.

Unfortunately none of those match the effects I want (Aurora for a single colour, and the reverse of that so it lights up from the end of the strip and works back to the start - so I can trigger LEDs either sweeping up the stairs or down the stairs depending on whether a motion sensor detects someone at the bottom or top of the stairs) so having an interface on the app in order to effectively create my own Predefined Effect would be super useful.