Not sure if it’s possible, but how about delays in the HTTP API so you can have things change over time? Something like…
&FX=25&DL=1000&FX=0
You mean you would rather have WLED manage the delay than the thing sending the HTTP request to send &FX=25, wait 1000ms, and send &FX=0?
I agree it should be part of the API, and part of the presets as well.
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Exactly.
This is a great concept in my opinion and I am going to add something like this, but a bit differently, a feature called playlists. Basically it would allow to load a certain preset, wait X seconds and then load the first (or a different) preset again 
Implementing the delay feature exactly as proposed here would be possible, but require some sort of queue to keep track of the changes, which I don’t want to add at this time
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