How to enable ack button functionality on FST-01sz

[Mark Debian]

Hi Everyone,
Can someone tell me how to enable the ack button functionality using FST-01sz?
When I configure latest gnuk, before compiling, the output of the configure command says:"Acknowledge button is supported"
According to:
Flying Stone Tiny 01SZ Test Plan


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Flying Stone Tiny 01SZ Test Plan


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The FST-01sz has "a hall sensor to use a magnet as acknowledge/confirmation user interface".
However, I can't see any way to enable this ack button functionality, or rather to force its use, when encrypting/signing/authenticating.  I have looked through the admin menu options using gpg --card-edit.  I also couldn't find how to do this in the gnuk-users list archives or anywhere.
So, how do you enable and force the use of the ack button functionality?
Regards,Mark.
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