As part of Google Summer of Code 2024, @Venky has added keyboard navigation to App Inventor. This should allow for the creation of apps as well as designing simple user interfaces without the use of a mouse. Blocks editing has some features, but we expect most keyboard navigation of blocks to be part of the Blockly library and its plugins.
A list of shortcuts can be found under Help->Show Keyboard Shortcuts or Alt-?.
Thanks to our GSoC contributors for making this such a great summer in GSoC.