undoing checkout on a branch

[yonatan.lehman]

I want to do an uncheckout on an entire branch in the same way I can do check out branch and check in branch.

Way back in 2014 this was not available,
https://sparxsystems.com/forums/smf/index.php/topic,25186.msg200688/topicseen.html#msg200688

In EA 14 it's not available via the GUI.

I'm fine to write a script that will walk down a branch and undo each package - but I couldn't find an API to undo checkout even on a single package.
Am I missing something?
Perhaps this is available in EA 16?
Is there a good reason why this is not available?

Cheers
Yonatan