No you're right, they can't figure out open tunings or drop D/B tunings with the pedals to my knowledge...least not yet anyways. Most just pitch the strings down ( usually 3-1/2 half steps) or can change it a whole octave, giving it almost a bass synth sound. The Morpheus can also blend the sound from your normal tuning to an Octave down at the same time, a bit like an Octaver.
The closest I've seen that can do weird tunings was that Axcent Tuning System that required some heavy modding of your guitar but could do about any open or drop tuning with the click of a button. Jimmy Page used one in the 90s and early 2000s on a Gold Top Les Paul, as well as that O2 Arena show with most of Zeppelin some years back.
View attachment 86121