Terraformer Parameters
Perhaps the terraformer could include a right-click menu where you would place the blueprint, then input parameters "Radius" and "Intensity".
Where radius is simply the area to be affected, and intensity is the chance/tick that a given block will be terraformed.
Instead of consuming as much energy as they can, EU cost could be calculated by (Radius) x (Intensity) X (Blueprint Cost)
This would make them more manageable to use in systems of machines (Not sucking up all your available EU)
as well as making their effect more predictable (Terraform a small block out of a desert, rather than widespread havoc on the biome).
This would also make them more multiplayer-fiendly by not accidentally encroaching on someone else's buildspace.
Comments / suggestions welcome, thank you!