Instead of a knight doing this, how about an energy-carrier which can be set to either transfer energy between RF source and receiver blocks, or seek out robots (active, inactive, or both) and juice them up enough to get home. It will always track its distance to "home" and return there once it hits its limit, but have a much higher RF storage than other robots, letting it seek in a wider radius and still have a bit of RF left over for others to share.
The problem with that is that bots don't actually use that much energy. The main reason bots are lost is either cause their home dock was broken, so they don't know where to return to, cause no power dock was available or because the tried to fly into an unloaded chunk. At current all these options result in the bot dropping to the ground and sitting there idle.
The current way to find them is to spawn in the 'debug tool' using cheats or creative mode but the ability to locate bots that aren't responding any more really does need to be a built in feature for one of the bots. The knights make the most sense cause they're the least likely to be doing anything. Plus it fits with the image of "knight".
Re the Façades thing. Why not just make it like Carpenters blocks.
Change the recipe so you craft the façade out of wood, then cover it with any other block. Then all façades will have one recipe ...
Re the comment about ghost blocks for builders... This has been mentioned and discussed before. The builder object and the builder robots both have a flaw in the way they work. The most efficient way would be for the blueprint to be stored similar to the clipboard saves from worldedit, then when the builder machine or robots operate it first removes all blocks from the area occupied by the blueprint (in the case of robots by using diggers and miners to remove blocks) - then it places the blocks starting from the bottom x/y to top x/y (as one would expect)
Right now cause the blueprint is dependent on copying what's already in the map there are too many ways for the build to crash. The idea of ghost blocks might make it easier but I don't see as being necessary.
And I still think builders / diggers / miners could be used for a lot more things if you had a way to give them better instructions. Again - some kind of control console for advanced programming instructions.
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