I just added an extra column in the LPE stack dialog.

That's awesome! It's a great enhancement to the Stacking UI.

I'd like to make a request for a better name than "visibility". It
enables/disables the effect,

I like the Active/Inactive name. The gears may be a good idea, but they would have to be discreet because these buttons are not suppose to be eye-catching.

Oh and I've just seen the new LPE powered freehand shape tool, it's beautiful.