Video options

Hi,

when inserting a video from file, i am given options to select, including delaying the start of the video for a number of seconds after the slide has appeared.

After having saved and inserted the video, if i want to change the time period for the video to start, how can i do this?  I cannot see a button that allows me to bring these options up again, nor in the video editor.  The only way to do this seems to be deleting the video and then inserting it again.  Have i missed something?