session.showstatusbars = Tab ; Toggle display of status bars
The current behavior of session.showstatusbars is to show them only as long as the key (by default, tab) is held down. This is not toggling. Toggling would be, if you press tab and the status bars are shown, they would be hidden, and if you press tab and the status bars are hidden, they would be shown.
Actual toggling would also be more useful than the current behavior, because it would let you see status bars for a while. For instance, that would be useful while selecting injured units for healing or retreat, or during a fight to target injured enemies. Selecting injured units in particular is difficult with the current behavior because you have to awkwardly hold down tab and shift at the same time while using the mouse.