ok, i found this out while Scrolling over the "Apply Stationery ts selected.
.. image before or after the first/last image in the selection. For a lot of people this may be desirable behaviour...
this function shoul be on the Keys "Page up" and "Page down"
The selection with the Arrow KEy and the Shift key, to select Pictures is alleready given. Try this. Mark a Picture, press shift Button and hold it, take the arrow key right. Nex Piture will be marked. Then press STRG(cntr)+I, take you changes, and now the arro key dont work anymore, thats the Problem. Ich hope you understnad now, :-)