I'm on Factorio 1.1.11, 2.1.6 of this mod, using "Shortcuts for 1.1" to manually target, What should be the targeting range? When I click the icon on the shorcut, on the right side of the screen an ion cannon "turret" overlay appears with the information, and the range is the same as the the default area of the ion cannon, 25, is this right?

The Ion Cannon is based on an artillery, therefore a range is displayed there. This can be ignored because the artillery is in the orbit and can target all what is not under fog of war.