In a process or value stream map there are many different shortcuts you can use on your keyboard.
ESC Closes modals/ pop up screens
ALT-A Create a new activity
ALT-D Create a new decision
ALT-I Add input
ALT-L Create a new process link
ALT-O Add output
ALT-T Add/next task
ALT-U Add trigger
ALT-G Open set gateway options pop up