Not sure if this is feasible, but since we have a dump score log for keyboard midi inputs, wouldn't be possible to create a similar system that would allow us to record the tweaks in real time made through the advanced loop fill (and hopefully also burning the arpeggiator notes without waiting times), or even just by adding deleting notes on the fly every time the pattern loops? Some kind of performance mode recording that extends the pattern length with all the variations you've just created on the fly.
I'm not sure how FL's step sequencer and its rithmic tools are different when compared to midi note input recorded in the score log, but wouldn't be possible to create a dedicated score log for FL's "not so midi input stuff" such as the step sequencer, fill tool, arpeggiator, etc?
Imagine being able to "burn ti midi" instantly, or being able to paste on the piano roll all the real time tweaks you did with the fill tool after pressing play.
Something triggered by the play button that starts to record what you're tweaking on the fly. That once you decide to paste, gets pasted already synced to the grid because synced through the play (+record button too?) button.
Probably you thought already about this, but yeah, i tried anyway.
Dump score log for Advanced loop Fill and Arpeggiator
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