The multi-episode tv disks are often times so large that I don’t like to compress them with Shrink. The final result isn’t very good in my opinion. With those, I just bite the bullet and use dual layer disks (Verbatim only).
The dl disks are expensive, yes, but far less than having to buy the series again if you ruin one of the originals.
It is possible to pick out the episodes and rip only them as imkidd said, and I’ve done that, but it is extra trouble when I want to put a couple of episodes on a disk and have a menu to choose between them. Reauthoring isn’t hard, its just another step to have to do.
So, for the sake of convenience, I’ve just gone over to dl disks for tv series dvds.