Radar & Cliff Explosives dont appear to be researchable. Is that the intention?

Radar is renamed to "Sensor node" and comes in multiple tiers - Needs mineral sample, climate sample, mechanical prototype, electrical prototype to research.
Explosives research lets you demolish cliffs, vanilla had it as a separate item/research - Needs mineral sample, climate sample, mechanical prototype, electrical prototype, Chemical sample to research.

There are also differences between sensor nodes and radars. Since there are no biters, they're less of a life and death thing, and more of a quality of life thing. They have a larger radius in which they allow you to view your base remotely (their main purpose here), but a much smaller radius of the map that they scan beyond that. So you don't really use sensor nodes to explore the map like you might use radars. There is a different technology, called exploration for that, where you launch scout drones to explore remote sectors of the map.