What feature do you want to see added?

A feature similar to //flora, but instead have //sculk apply random sculk throughout a selected region.

To give the user full control, let the user control whether it's only sculk veins, sculk blocks or both. An option whether to include sculk catalysts, shriekers, sensors or all of them and an option to decide how scarce or common the spread is.

Are there any alternatives?

//overlay does not give the desired effect to place veins on top of blocks, as it more often than not gets rid of blocks in the process and veins rely on directional block states.

Anything else?

//sculk <veins/blocks/all> <catalysts/shriekers/sensors/all> <%>