It would be great if, whenever there was no tool active, we could press "Enter" or some other keyboard key and Bluebeam would reactivate the last tool the user had active previously (not too different from AutoCAD and Revit behavior).
For example, if we are using the highlight tool and stop doing it for whatever reason (to stop and read something, or simply hitting escape), once we are ready to continue highlighting we could just press enter and go on.
Similarly, if we are placing a markup symbol from our toolset and stop for whatever reason, we should also be able to simply hit enter and continue again.
I believe this would greatly help speed up markup generation tasks.