quicktime-vr could be an option, don't know if it works within Flash, it does within Director, wich can export in the shockwave format. altho you wouldn't get the pixel quality.
Maybe you should work with a grid, invisible symbols that act as locaters, per scene the parts of the grid have actions, like walk here, elsewhere: if gridsection(this.section.x+1 is active or x-1 ...) open drawer, move chair. All build your grid in the same isometric dimensions, floor and 2 walls.
