This involves code modification in the dynamics. Please take a look at
dyn_em/module_big_step_utilities_em.F
dyn_em/module_em.F
You may set coriolis term to zero in these codes.
Some other codes (phys/module_bl_temf.F, phys/module_sf_temfsfclay.F, dyn_em/start_em.F, phys/module_sf_oml.F, etc.) may also need to be modified depending on your options.