As there are already discussions (as far as I understand) on how Modders for Stonehearth could e.g. get a cheaper version of Qubicle, how about creating a stretch goal for that?
The additional money could be used to negotiate a Stonehearth-Version of Qubicle (and other tools required to create Mods).
I know that this stretch goal would not be too attractive for all gamers at a first glance… but at least at a second. I have the feeling that Stonehearth will gain a lot from a striving modding community and so will players. In addition another gameplay stretch goal will cause further workload for the team… better get the things done right than getting more things in ;-).