Hi, thanks for your feedback. This should already be possible but maybe it is not clear enough.
When creating a scene, on the screen where you position the lights, you can tap a light. Then you can set the brightness for that selected light at the top. Repeat this for the other lights. Now whenever you activate this scene or use it on a dimmer switch, it will use that brightness.
For the effects, create a new effect or edit an already created effect. Tap Show advanced settings, switch on Set initial brightness and select a brightness. Now save the effect.
Please let me know if this answers your question.