Is your feature request related to a problem? Please describe.
As per https://wled.discourse.group/t/has-anyone-reverse-engineered-how-led-curtain-hooks-work/7423/11

Some LED curtains have a chip in the top tee that connects each vertical drop.

Some implementations just count the number of pixels and direct the remainder downstream, however, the one I have come across is a bit different.

This one always directs the input to the vertical drop, and will direct the stream to the next tee once it receives a ~5uS high pulse, followed by a low of ~35 uS.

Describe the solution you'd like
The ability to break the stream into N pixels, and between each chunk, send the 5uS/35uS pulse to address the next segment of the curtain.

I'm happy to cut the code for it, but some pointers about where to look & how to structure it would be appreciated.