repeat last is G in industry compatible. When you say use space as confirm in what area? With industry compatible most things are done using a gizmo. In many cases the Standard Modal Map is used in which case you just have to expand that then click add new button. Then click on the key map area(Where the A is on the right side) and press spacebar. Then expand it and change the blank dropdown button to apply. Of course there are many areas of Blender and key map changes depending on context and editor/region the mouse is over.
