We run into the same thing with attendance, and as such, those of us that are in the leadership group try to schedule things as best as possible.
On the weeks when we are short, I do the same thing of standing by the door or being up and moving through the building. We also have camera's that several of us are tapped into and watching off/on through the service.
Bottom line, do I think we are setup as best as can be? Nope. But it's better than several of the churches I have visited.