Does mri_glmfit-sim Monte-Carlo cluster size correction is also usable for F-test?

The doc says that it synthesizes a z map (I assume from a  normal distribution) for computing the voxel-wise thresholds and cluster size distribution.

Maybe I am wrong with my stats but I wonder if it is ok to use this null-hypothesis to a F-distributed data such as results from a F-test.

Thanks!

--