Good idea, here is a patch for the upload.php view to support ezkeyword datatypes:

Index: ezoe/modules/ezoe/upload.php


===================================================================


--- ezoe/modules/ezoe/upload.php        (revision 33)


+++ ezoe/modules/ezoe/upload.php        (working copy)


@@ -145,6 +145,10 @@


                        $content->setAttribute( 'alternative_text', trim( $http->postVariable( $base ) ) );


                        $content->store();


                        break;


+                   case 'ezkeyword':


+                       $newObjectDataMap[$key]->fromString( $http->postVariable( $base ) );


+                       $newObjectDataMap[$key]->store();


+                       break;


                    case 'ezxmltext':


                        $text = trim( $http->postVariable( $base ) );


                        include_once( 'extension/ezoe/ezxmltext/handlers/input/ezoeinputparser.php' );

The next thing you'll need is to override templates/ezoe/upload_images.tpl ( look for ContentObjectAttribute_caption, and add ContentObjectAttribute_tags for keywords ).

This patch++ might show up in ezoe/trunk quite soon..

UPDATE: done http://issues.ez.no/IssueView.php?Id=15139&activeItem=1