Since there wasn't a lot of input on the last question, I will answer both...
Probably how it would be like for any group of refugees in constant hiding from a powerful foe. The Knothole residents live basically in a hidden village undetected by Robotnik's survellience, so they do have the chance to try to live comfortably while always being on the alert for a possible attack. From what we see in Satam and a little in the older comics, Knothole seems to operate like any other settlement: residents live in comfortable huts, eat various dishes beyond that of bare minimum scraps, accomplish various tasks to maintain Knothole, and abide by Mobian laws that still preside them under the Acorn lineage. Knothole, compared to other freedom groups, is alive and thriving (by Super Sonic, Knothole finally was able to run on electricity compliments of the water wheel), so the residents probably do spend their time building and maintaining Knothole and keeping their spirits up with various forms of activities and entertainment. Being in a state of constant peril, however, the residents would still be on constant watch for Robotnik and probably partake in drills or training to be able to respond to the likely scenario of Knothole being discovered.
1. The swatbots are formidable enough for most of the Mobians to face (far more effective than Robotniks' other robot cronnies in other media), so I could see Robotnik upgrading swatbot's armor and weaponry. I could see Robotnik using more advanced designs of badniks to scout the Great Forest to locate Knothole (and seeing the various badniks found in the early Genesis games, we don't need much imagination some of these robots could be very effective in ambushing wandering Mobians). I don't see this version of Robotnik just creating various robots without a purpose; he uses what is cheap but effective. Any new robot he does create would have to be for a certain mission (scouting/spying/destruction).
2. I am not sure what the original plans for Naugus is, but I could see him having a different mission that counters Robotnik's world domination. His flashback reveals him wanting to explore the void for an unknown cause, but his episode displays that the void has given him a wide arrangement of magical power. Perhaps Naugus is interested in gaining more knowledge and magic to become a more powerful sorceror but to what purpose? Naugus did not view Sonic as an enemy and even freed him to save his friends from the void, so Naugus doesn't appear to view Sonic as an enemy that could stop his plans. I am curious as to what species Naugus is supposed to be...seeing there is nothing like him in the show (though I believe he does have a brother in the comics); perhaps his goal is tied to the legacy or lore of his species? Either way, Naugus' individual quest for power would put him in conflict with anyone who comes between him and that power: Robotnik, Snively, Sonic...
3. They may have tried that already and realized that Robotnik is too smart for that possible scenario. The FF have been able to gain information from defeated swatbots, but Satam never showed them being able to reprogram the swatbots to change alliegence. In Blast to the Past, Robotnik is shown locking the swatbot's commands to his voice alone (cutting off even his nephew from having a chance to command them); this could explain why the swatbots couldn't be reprogrammed to attack Robotnik. As for the robotic version of Sal that Rotor reprogrammed, note that the robot isn't part of Robotnik's swatbot force; it was a secret project Robotnik and Snively worked on to infiltrate Knothole. Since the robot isn't connected to the same programming as the swatbots, it probably wasn't given a safeguard to prevent reprogramming (much to Robotnik's dismay at the end of the episode). Most likely this is just a one time occurance for Robotnik; seeing how the robot was turned against him, Robotnik probably took careful measures in new projects to prevent possible FF reprogramming.
4. Not sure what these robots are, so no say.
5. I don't see GUN being part of the Satam universe, so my answer would be no.