[russellw]

It won't work because the BBCode that creates the plugin doesn't allow for it.

I could amend the bbcode to allow for two variables - one being start time and the other being video name so that you would enter something like (I've removed the brackets):

youtube=start time]video name[/youtube

but it would be a required parameter for all.

It's probably easier to not use the embed tags and just use the normal youtube link with &start=xx at the end of it.