kartu : first thanks for this great firmware

I have some questions :
- I did use the full installer for the 950, there's no /database/system/PRSPlus/epub/ directory on my reader. Is it normal ?
- There seems to be a bug : in the the viewer parameters, there are some (new to me) parameters for disabling some S, M and L sizes, when I click on M or L, the option disappears and I can't do anything anymore on the menu. It doesn't freeze though, the Home button still works for example.
- Is the only way to access games, calc, etc by assigning them to a button ? I thought I would find those apps in the Application tab.