Landscaping-only con... maybe repair at a stretch, but that might be OP. The Tank lab is the lab that needs landscaping the most even
without deliberate attempts involving enemy cons or dirtbags. Heavy tanks often find themselves in pockmarked landscapes, or Golis at the bottom of a crater after being blasted to heck by something that didn't kill it.
The other factor is the Goli's flamethrower can shoot through landscaping, making it popular for assaulting landscape-walled targets. So now that the flamer is gone, give it a beefy landscape-only nanolathe.
Of course, landscape-only nano might be messy, as I said above. Landscaping requires assist... Assist-only would be counterintuitive because the UI doesn't differentiate between assisting and repairing.
It's just a random thought I had... just that the Tremor-smoothing was a neat concept, and it'd be worthwhile expanding it out to other units in the Tank lab and expand landscaping gear out into other units