When in the Eden editor, it would be very useful to customize a units load-out through the virtual arsenal. When right clicking on a unit, you could add an option to open that unit in arsenal mode. You would just spawn the arsenal on the unit like in Zeus. Additionally, you could give all units in a group the same load-out by right clicking on the group icon, selecting arsenal and composing a load-out for the whole group. One last addition would be to add an additional section to the attributes screen of units allowing you to equip them with saved load-outs from the arsenal.

Once again, my apologies if this is already on your todo list.