Hans,
few observations/suggestions:
1. Practice mode does not make sense in SSB I guess. When enabled in CW Keyer menu and SSB mode is selected it could be temporarily disabled and then when CW is selected again it could be automatically re-enabled.
2. Displaying CW decoder text in SSB (in fact also in DIGI) does not make sense and looks rather disturbing. I suggest CW decoder part of the screen could be automatically cleared when SSB/Digi mode is selected or perhaps re-used to some other purposes in these modes. Mic input level would make sense in SSB.
3. Short press of left button bring up keyer speed in SSB. Does not make much sense
4. After copying the firmware file my QMX did not reboot itself. All is ok after recycling the power.
?