10s campy shifter + 9s shim der does leave a nonfunctional click that is completely inconsequential. Derailleur movement is limited by stop screws to prevent spoke damage.

11s campy shifter with 10s shim der + cass will probably work. I do about the same thing with 10s campy veloce shifter + 9s shim xt RD + 9s shim 11-32 cass. I started out using a Jtek adapter, then later discovered the adapter was unnecessary if I simply rotated the cable fixing bolt 90 degrees CCW. The Jtek adapter works well, but due to the small cable bending radius it will greatly shorten gear cable life.

http://www.ctc.org.uk/cyclists-libra...gears/shimergo

You can fit smaller granny ring to your crank (24t minimum IIRC), but there are hardly any FDs that can accommodate that wide a gap (46->28) - most Shim FDs can handle only 12t jump and additionally have min and max ring size specs. You can bend the FD cage and extend the range, but don't bother unless you have the temperament for frustrating experimentation. It is difficult to get Shim road shifters to work with Shim mtb FDs and mtb cranks, and adding a Campy shifter doesn't make it easier.

I think you need to first determine the gear range suitable for your needs, then go from there. I know I need 18-20 gear inches on the bottom and really no more than 90 gear inches on the top for loaded riding. I can get by with a low of 26 gi and 104 at the top for unloaded riding.