Regarding dragging of text boxes: The larger Jot box drags just fine, since it has a border you can grab that shows a "move" icon when hovered over. However, the title text box is a gigantic pain to try to move. There is no border to grab on, and I struggle with click-on/click-off trying to grab it instead of just clicking into it (which starts text editing). This and the issue with slow panning are probably my biggest QoL gripes at the moment, they make it very frustrating to move things around or focus on different sections of the board.
As for multi-select, I've been trying to use shift-click like you mentioned, but it isn't working. If I hold shift while dragging over an area, nothing gets highlighted. If I hold shift while trying to click-and-drag multi-selected elements, they still don't move.