An alternate track might be had in an AppleScript, saved as a Service, written to get the value in all cells of the table and replace the blanks with the value zero. As Service, it would be installed as a menu item in the Numbers > Services, and could be assigned a keystroke combina...
2.1.1452 Part 1 Section 21.2.2.42, dispBlanksAs (Display Blanks As) 2.1.1453 Part 1 Section 21.2.2.43, dispEq (Display Equation) 2.1.1454 Part 1 Section 21.2.2.44, dispRSqr (Display R Squared Value) 2.1.1455 Part 1 Section 21.2.2.47, dLbl (Data Label) 2.1.1456 Part 1 ...