I have a Kregjig & use it for face frames & when I built my EZsmart table.
I do understand how to use it for cabinet case assemble but don't see why I would want to, Its much easier to use glue & a nail gun.I would think with out a dado you would need to screw from both sides which means you have to hold it in place & drive screws instead of just holding it & driving nails. Maybe I'm missing something here but I'd rather run a dado on the table-saw or router/router-table a quick pass & usually its several panels that need the same thing & then run the glue in the dado & shoot nails. Besides that when the cabinets are installed shimmed & trimmed they won't be going anywhere.Its not like furniture that gets bumped sat on wiggled on hauled from here to there etc.
"Forget the flat stuff slap something on the spinny thing and lets go, we're burning daylight" Bart Leetch
"If it ain't round you may be a knuckle dragger""Turners drag their nuckles too, they just do it at a higher RPM"Bart