Scotty used a phaser to cut through a bulkhead in The Naked Time; "blowtorch" could be its own different setting. Under the original effects, there was no beam shown at all in that case (as if it was --say-- infrared).
I actually liked that the beam wasn't shown--focused to the point of an invisible, sub-needle thin beam to cut that material
Dematerialize was a setting IIRC
As for stun--they are working on that