There's more to switching PAL/NTSC: The C64 Reloaded is shipped with a 8701 replacement circuit for timing generation. This timing generator is PAL, and it puts the PAL/NTSC jumper "out of service".
To make it NTSC, you will either need a real 8701 chip as timing generator, or an NTSC version of the 8701-replacement, which is available separately.
New C64 Reloaded boards are in the making. I expect that there will be two more waves until they are sold out.