[nerbert]

In the Custom BB Codes feature there's an input for the path to a custom image for your tag. That puts them in the advanced editor. To get them into the Quick Editor you will have to edit the file vb/ckeditor.php. Starting around line 250 find protected junction setToolBar(), there you see how the various editors have their buttons selected. You want to add the line

$this->addCustomToolbarButtons();

to whichever is the quick editor, "qe" I assume