according to SWTBot documentation [1] tests should not run in UI thread hence add:

<booleanAttribute key="run_in_ui_thread" value="false"/>

In order to make it work on German system I had to pass US keyboard layout as VM parameter, in order to play with timing parameters I added the other 2 parameters :

<stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="-Dorg.eclipse.swtbot.playback.poll.delay=500 -Dorg.eclipse.swtbot.playback.delay=0 -Dorg.eclipse.swtbot.keyboard.layout=EN_US"/>

[1] http://wiki.eclipse.org/SWTBot/FAQ#Why_do_tests_run_on_a_non-UI_thread.3F