The "left right click training" activity is suitable for mouse attached devices, so it should be enabled only on when the device running GCompris has a mouse available. This can be done using QInputDevice but is only available in Qt6.

Documentation for QInputDevice - https://doc.qt.io/qt-6/qinputdevice.html
Source code - https://code.woboq.org/qt6/qtbase/src/gui/kernel/qinputdevice.h.html#63

Details about Input Event updates in Qt6: https://www.qt.io/blog/input-events-in-qt-6