Will it ever be re-added?
I know that the coding for a thumbnail BBC code isn't too difficult, assuming you have no clashes with any other packages installed with SMF it would be a nice re-introduction.
The same for YouTube BBC codes I guess. They would both be very nice to have back in my eyes. I guess the only thing that would cause issues is comparability with other packages, as I said, but both codes are rather basic and shouldn't conflict. Then again, what do I know, I don't know what you have installed on the SMF xD.