### Summary Hello everybody, I'm going to implement the flags for the [Freesurfer longitudinal pipeline](https://surfer.nmr.mgh.harvard.edu/fswiki/LongitudinalProcessing) in [ReconAll](https://github.com/nipy/nipype/blob/6d8efd74f7f019298c00f5486db479fef5657561/nipype/interfaces/freesurfer/preprocess.py#L633). I would like to ask if there is interest in a pull request about that. ### Actual behavior The [Freesurfer longitudinal pipeline](https://surfer.nmr.mgh.harvard.edu/fswiki/LongitudinalProcessing) needs `recon-all` flags like `-base` `-tp` `-long`, whose are not implemented yet.