I have a few ideas about builder bots (of any type).
1. A toggle (in engine settings maybe) to choose from one of two behaviors for builders: one where all bots of that type focus on the building that's closest to being done and one where they spread out so that each bot is building it's own thing. In some cases I've found I prefer one way or the other so it would be nice to be able to command the bots.
2. I notice many times where I am attempting to manually force bots into one or the other of the two modes described above that they don't listen. I click the bot and tell it to move to X building but it goes there and builds Y building instead (a neighbor). This happens with large buildings while zoomed in so I know for sure I'm clicking the right one. Example: I may have told all my dig sites to upgrade but they all need artifacts to do so (and I don't have enough). I want all bots to finish one site first before moving to the next one. So I click each one and click the site I want to start with so that the artifacts I do have all go to that one building and get it done instead of having ten that are almost done and having to wait.
3. The ability to summon all bots of a certain type to a tile. Or all idle bots. Example: I've got a bunch of buildings in process but suddenly want them to all stop and build something else right away.