You can write a macro to simulate the pressing of the Escape key. Then you can assign that macro to a custom toolbar/menu entry. The new main menu item “Virtual_Keys” contains two new items: MyEscape and MyReturn. And the macros are assigned to the Standard Toolbar too (without usage any Icons)
Here is a sample file what contains tha macro and the assignation of the macro (it works in this document only). Result: you will able to exit the cell edit mode by one (or two) mouse click - “without your another hand”.
MyEscape.ods (15.1 KB)