I have a few of these, inluding:
The Story of the Mini
Mustang ones
Bathurst crashes
etc.

Should these be added?

Well that one in contributions called Extreme Machines, thats a documentary, so i dont see why not

any other opinions???

If these are available on DVD and sold in shops, sure.
If these are obscure things not found anywhere I do not think it is worth adding.
Note that if they are not on IMDB it is good to provided some extra info about it, in case people want to find them or to match them if they are later added to IMDB.