For single pack operation (bleed trip off, wing body overheat isolation, s/e flight etc) there is no reference to turning the recirculations fans off. With single pack the operating pack reverts to high flow which will increase bleed demand. The recirc fans will in turn reduce bleed demand as they are effectively recirculating conditioned air to the mix manifold. You would be making poor use of the system if you turned them off, unless of course you had a fire!!
I don't believe there is any direct link between left and right pack controllers and the left and right packs. It is simply a system with redundancy. I may be wrong.
A smarter man than me probably has a better answer to the above and q's 3&4
Best of luck
