Designing a spatial nAFC task is actually very similar to designing a temporal nIFC task: there is Spatial/Temporal options under the nFC procedure tab. Have a look at the "Procedure" section of the on-line documentation:
http://www.psykinematix.com/documentation/Psykinematix%20Help/Procedures.html#nafcYou may also check out the "4-spatial-AFC" experiment for measuring RDK coherence threshold found in "Demo, Examples & Tutorial --> Experiments --> RDK --> Coherence Threshold" under the "Storage" section of the Designer panel.
Hope this helps!
–– The Psykinematix Support Team