A perfectly valid question.
It has been asked a few times on Facebook and in private correspondence, but it is the first time it's asked here formally.
At this stage the Smart Magnet Rig system is FK only with the addition of certain inverse chain selection methods, so you have to be creative and work with this: Locking feet layers, moving the torso and matching the feet with the legs with the available tools.
In this process you will be assisted by the inverse snapping - Smart Magnet Joint shortcut [Ctrl+`] , inverse Smart Transform Point [Alt+2] [Alt+3] and the various inverse possibilities that Smart Transform gives you [Alt+1] [Shift+1].
At this stage I will also say this:
The SMR system is being actively developed and features are added with each new release. So keep an eye on our news feed, our YouTube channel and our Facebook page for future announcements.
We really appreciate your kind words regarding our work.