IMHO, I think the allure of xlights is as a small footprint, reliable player and scheduler which supports a lot of hardware. I almost think adding a sequencer could bog it down from what its already good at. It seems like more hardware support (E1.31, pixelnet) is the big hitter improvement. Then pair with olive to do the sequencing, then offer xlights as the scheduler and perhaps have olive sequences as a support file type?? ... Just my $.02 worth ...