I know I'm kind of late to this, but...
I've been wanting the Sabertooth to get a TLC treatment for some time. Personally, I would have liked for the Sabertooth to have a "roar" command (similar to how the Thylacoleo roars).
Also, I feel that Fear Evolved could use more Skeletal Dinos: i.e. Sabertooth, Mammoth, Equus...
(Thirteen has created a mod titled "Blessing of Unicorns," and his unicorns have a visible skeleton inside of the 3d model; Wildcard could stand to use the assets for the Equus Skeletal from him)