The Multi Driver anim bp node allows you to drive multiple curves or bones at once, using just one node and a data table with all the mapping rules. It's a batched version of the Bone Driven Controller node. It simplifies your anim graph and removes the overhead of running multiple nodes. Additionnaly, it fixes the gimbal problem, allowing to use rotaion around Y axis beyond 90° and it also allows for different modes like add, replace, multiply, min or max.
Example project: download "Additional files" on Fab (on the web).