Installed your software successfully, great so far thanks!
Took a bit of tweaking to get the touchscreen re-calibrated after rotation, had to include:
xinput --set-prop 'FT5406 memory based driver' 'Coordinate Transformation Matrix' 0 1 0 -1 0 1 0 0 1
in /etc/xdg/lxsession/LXDE-pi/autostart to get it working correctly.
Quick questions if you don't mind - Is it possible/easy to change the quick bookings from 15/30 to 30/60 minutes?