well let me post my thoughts here. For one not all upload boxes are the same size never have been. The flash upload code has always displayed the way it shows the cancel button is suppose to be there.
Really the only thing I can suggest that can be improved is making sure any input box has the proper vb4 class which I think is primary textbox
You can download my uploadphoto2 template for that fix
I can not modify how the flash uploader works or looks.