Isometric views by gizmo steps with ctr as 45 degree in relation to grid

Now gizmo have 90 degree step when alt, want 45 with shift to reach "isometric view".

If gizmo is moved far from 90 and 45 in relation to grid as custom, but want move around 90 or 45 as +45 or +90 degree then want hold shift btn and use arrow keys or clicking on gizmo. It's possible to rounding by numkeys as 4,6 and 2 8. As I discover to move 90 degres is 6steps, 45 is 3steps.