The migrations for February, March and April are all already checked and applied if you use the Autotune Configuration Tool, built-in to JFBConnect. Simply go to the "FB App" area, hit "Refresh" and then hit "Apply".
All the currently available migration settings, through April, do not adversely affect any fucntionality within JFBConnect. Facebook announces these changes months in advance just so we have time to release updates (if required), add the options to Autotune, and make sure things go smoothly. You can safely enable all currently available migrations without any issues.
Autotune is updated about once a month, or as new options are added, so it's recommended to re-run Autotune about every month... or when you get a new notification from Facebook. If we're doing our job, you shouldn't have to worry about those settings
Hope that helps explain,
Alex