Hey actors!

Question for you,

I'm working on my haunt layout (as far as positioning of actors is concerned) and I'm running short on actors this year. How do actors feel about having to move from sector to sector within a haunt? Is it too difficult to ask actors to move about and play 3 or 4 roles or should I try like crazy to get enough actors to fully staff each sector of the haunt (we have 9 sectors each with 2-3 rooms in them).

Also how effective is it to have just one actor in a room (we have fairly detailed sets so that helps).