The Pro Edition of Plugin Commander (
http://www.plugincommander.com) offers an option called "No Dialog" under File > Preferences > FF/TF. If you activate it, you can create FF plugins that show no dialog and apply the default effect immediately.
After you activated the "No dialog" check box, you can double click a FF plugin to display it in the FF Editor. You can adjust the slider settings as you like in the F FEditor. With the "Save As" button you can overwrite the old plugin with the new one that shows no dialog. If you want to turn more than a few FF plugin into dialogless versions and don't need to change the default slider settings, you can also use the Convert command in Plugin Commander Pro.
By the way, why do you need VB Scripting to batch process several images with actions? Photoshop already provides the File > Automate > Batch command to do that.