Adding a simple GUI interface to something like imapsync would be very useful for end user migrations to ensure email is synchronized before/after dns changes. Plesk includes this and a lot of our staff have found this to be a useful tool for not only internal usage, but also for customer self service. Bonus points for accepting/syncing multiple mailboxes at once.
I like this idea, and it will greatly simplify several situations when migrating customers from other control panels. Email resync seems to be one of the most common post-migration requests, so this can help ensure smoother onboarding for new DirectAdmin users.