adding new fields to movie table in database

I am implementing a feature that adda field to a movie/episode that will play a specific title on a DVD/BluRay.
I first added it as Cnn field, but only after some time did I realize that SQLite doesn't have an "add after" option ('m using mysql).
I changed it to add a named field after idSet so that some other people could try it.

My question is - what is the preferred implementation for new fields?
I see the last two changes on episodes and movies was done as a new field.
Adding a new Cnn field at this point requires a temporary table and copy (but not if your upgrading from Eden)

thanks
mike