Unfortunately I have quite a backlog of other projects that I need to clear out, though Simple is AGPL so anyone is free to fork it. However I am also looking for employment opportunities.

Simple is already highly parallelizeable due to the fact that it relies on dynamic programming. Adding more threads of execution is just a matter of popping off another candidate test point from the priority queue while the objective function is already being evaluated at another point. I was planning to include this feature in a more mature release.