Hm.
I don’t think the OP idea is useful. But it points to a general problem with the roboports.
The others already wrote what could be done about the basic problem (position of roboport, taking robots out with filter inserters). Besides that I would also say, that if overfilled roboport exists, than it’s a clear sign of misunderstanding or not automated insert.
With that in mind I would add:
make roboport behaving like a buffer chest. When a robot is out of work he looks first, if there is a roboport without fulfilled buffer-request. I’m not sure if this should work also with bots already parked in ports, that is part of development.
There is another suggestion in this forum (
viewtopic.php?f=6&t=39474 Roboports should output missing materials to circuit network ) about better robot network signals, like we need the number of robots waiting for load and so on. See list of suggestions at the end. With those signals and this and other suggestion together the robots could be really nicely automated.
That would solve
A) when a robot network is overfilled, how can I get robots out?
Just sent request signal (100 logistic bots) to a roboport and move them out with filter inserter. Yes, of course the roboport signals should have a third option “buffer chest” which behaves exactly like a buffer chest.
B) for mod x I need to take out all robots of some type: see A)
C) How can I make sure the repair robots are fast enough?
Request some construction robots to your border roboports. Add a repair pack buffer chest nearby. Or much better: how nice would it be, if the roboport buffer chest feature can also request repair packs?
Related stuff :
viewtopic.php?f=6&t=28820 repair packs signal
viewtopic.php?f=66&t=16798 much more related ideas, like
viewtopic.php?f=6&t=12644 Control the amount robots
viewtopic.php?f=6&t=8925 Distribution of robots
viewtopic.php?f=6&t=10152 Controlling robot distribution
viewtopic.php?f=6&t=39474 Roboports should output missing materials to circuit network
viewtopic.php?f=6&t=68233 Roboport contents
viewtopic.php?f=6&t=67650 Roboport like a Provider/Requester chest for bots/tools
viewtopic.php?f=6&t=63965 no repair during battle
viewtopic.php?f=6&t=60980 Bot recall