When using the maker pen in Advanced Creation Mode, to move down you should be able to use Right Click+Q just like in Unity, since the other keybinds for movements are all the same as Unity. (Right Click+WASD to move, Right Click+E to go up)
As of right now it is Right Click+Ctrl, which is different from Unity, and it is slightly annoying when switching back and forth from Studio to RR while building.
(Also maybe I’m crazy but I feel like in the past Right Click+Q used to work in RR while in Advanced Creation Mode?)