The input model feature in MultiTerm can do this. In current releases, you'll need to work with one of the legacy layouts in Studio (not the Default Layout) and pick an input model. The steps would be:
1. In MultiTerm, create the input model and fill in the default values you'd like to use.
2. In Studio, for adding new terms, pick any layout except the Default Layout. For instance, pick the Flags Layout. You should now see a drop-down list with the input models you created in MultiTerm. As soon as you start adding terms, the default values from the input model will be used.
More info is available in the documentation. Also, in future Studio releases, the new Default Layout will also be able to be used in conjunction with input models and then you can use them across the board.
Thanks
Daniel