I would like to see a way to create load cases based on existing load cases. This would be useful for making varations of load cases and load cases dependent on other loads.
For example, equivalent horizontal loads from structural imperfections are horizontal loads dependent on the vertical loads. It would be useful to be able to create a horizontal load case based on a vertical load case to easily account for this. The horizontal load case should be dependent on the vertical load cases, so a change or addition of loads in any of the vertical load cases automatically generates a corresponding change in the horizontal load case. There should also be an option to unlink the load cases so a update does not automatically generate a change.
This would also facilitate creating load cases in different directions, as is needed for wind loading, seismic loading, accident load et.c.
The only way to do anything similar (to my knowledge) today is to go into the load table and copy a load case and manually edit the load case assignment, the load size and and the load direction. This does however make the load parts of the horizontal loads untraceable, so it's hard to keep track of which loads have been used to create the horizontal load case. Using load combinations allows you to combine loads, but not edit the directions of the loads. It is also common practice to only create load case combinations out of basic load cases.