I have been able to setup keepassx (remove some columns, entry detail view) to improve usability. I guess editing .config/keepassx/keepassx.ini is another way to tune the application for mobile usage. The "first letter" search helps but we can expect more. The "last file" bug is terrible and I cannot select a group without trigger drag-and-drop !

As I cannot be satisfied by a regular export to PasswordSafe, I have decided to get the git sources, and add "ifdef" statements to restructure menu entries and group selection when compiling for Maemo (Q_OS_MAEMO ?)