How to append text to clip name.

Hi @vidar.
Welcome to the forum and thank you for asking!

Here's a script that will append ' PREF' to your clip name.
Note we (almost) don't use the keyboard but we're setting the value of the Name text field directly in code. This makes it much more stable.

function renameClip(callback) {
    //Make sure Pro Tools Edit Window is active
    sf.ui.proTools.appActivateMainWindow();

    //Make sure we have no search in Clips list - if we had, Clip Rename won't work (Pro Tools bug)
    sf.keyboard.press({ keys: 'cmd+shift+d' });

    //Clip Clip->Rename...
    sf.ui.proTools.menuClick({ menuPath: ['Clip', 'Rename...'] });

    //Wait for 'Name' dialog to come up, assign the dialog to dlg variable
    var dlg = sf.ui.proTools.windows.whoseTitle.is('Name').first.elementWaitFor({}, 'Could not find "Name" dialog').element;

    //Find the first text field in the group with title 'Name'
    var textField = dlg.groups.whoseTitle.is('Name').first.textFields.first;

    //Get the current Name
    var currentName = textField.title.value || textField.value.value;

    //Make a variable with the new name, based on the old one by calling the callback function provided in the 1st argument
    var newName = callback(currentName);

    //Set the value of the textField
    textField.elementSetTextFieldWithAreaValue({ value: newName });

    //Press OK
    dlg.buttons.whoseTitle.is('OK').first.elementClick();

    //Wait for the dialog to close
    dlg.elementWaitFor({ waitForNoElement: true });
}

renameClip(function(oldName) {
    //Make the new name the oldName plus ' PREF'
    return oldName + ' PREF';
});