Glad to help.
The Comrefs have not been updated, all I meant was you should always go back and consult them every time you use a command you are not very familiar with or when you get an error message. OFP scripting language is too subtle to be used mechanically - you have to understand what you are doing otherwise it won't work.
I tell everybody to read the comref from front to back, like a book. Don't stop to understand every command, that would be far too long an boring, but get a feel for what's there and how the person who wrote the scripting language thinks. Solving a crossword puzzle is much easier if you know the style of the puzzle creator: OFP scripting is similar.
Now, the new questions. For most commands you should probably use the driver. However this is a good case for experiment as you go to see what works best. Use move (which is an order for a group, which is what the crew of the chopper is) rather than doMove (which is appropriate for a single loon).
2. It makes no difference. It's probably slightly simpler to insert a working chopper rather than have the crew seperate, but it really depends on the exact circumstances.