Can I get a MIM fender jazz custom ordered with a maple fingerboard instead of rose wood, and if so what would it cost more?
This is not possible. Fender doesn't do custom orders on factory instruments. You might try buying an aftermarket replacement neck.
Here's an MIA.... http://www2.marsmusic.com/store/product_new.jhtml?catid=1068&prodid=8399&skuid=0&deptid=4