Clear Smoke: Could it become lockable?

[MarkSheppard]

When you're playing a North African Desert Scenario, all the smoke on the map tends to obscure your vision of where your units are, especially if you're moving a lot of units on the same area. While the "clear smoke/fire" button is useful, it doesn't last after you move a unit. Perhaps a toggle lock could be added to the button? E.g. click twice to lock it on clear, so that you can see and move your units without the interference in the way?