SUBSIM Radio Room Forums - Editing a stock mission?

Please forgive the newbe question as Im still kinda new to the game and have not yet used the editor or gotten into a carrer. So here goes a question about the editor.
Been hammering some single missions and noticed the stock missions lack secondary objectives. For example I went through serious tonnage with the coragious mission even invaded an enemy port and then decided to buzz the channel and try a home port. There's no completion like there was in shII. Searched and was able to find other missions but before I grab some are the stock missions incomplete by design in order to learn the editor?
Im thinking make a copy and follow some of the guides.
What i'd like to try and accomplish is a homeport objective, and maybe start the mission a bit sooner with some jazz like a report or sighting and at least some starting time so the jazz isn't right up front like the Bismark single, man. Got to wonder what would happen if I fished at least 1/2 the warships before they meet up.

mods I apologise if this should be in the mission designer forum, if so please move. Looks like it's set up for editor vetrans making new missions from scratch is all.