Point 1: City building in bad locations can be highly profitable in game play terms not in trade arrows. i.e. I usually like to play where I cover every available space of my territory with cities because:
- This stops the enemy settling/wandering into the spaces left
- Because the city sqaures will overlap it is useful to shove a small cities in gap with SDI defences, if you plan it right you can have a small city - on a mountain - with city wall stocked up with mech. infantry and stealth figters covering the defence for four large sparly sububand cities
- Those small cities make perfect forts for your troops... expensive but VERY useful.
So If I have a size 4 city at the end because it is built on a mountain, next to plain which just happens to be on the route I do not to be disqualified for it... (plus it is hard to say what I built the city for, if it has just been built.)
Point 2: The game designers set the limit at 127 because of computer programing limitations. they could have forced it to 63, but I've had a city on pop 70 without cheating. (one game I send every city which had an "odd" surplus to the capital.. I had a lot of cities.
Point 3: Airbases, surrounding your landmass with airbases is a good defense against nukes... e.g. give your outer cities SDI and complete the rest of the coast with airbases I prefer to think of them as a enargy shield which grounds air units. (heck you are on future tech by the time you start trying to defend extensivity against a nuclear attack.)
Point 4: If a good explansion to WHY and HOW a "cheat" is used then I see no reason not to include it. (apart from going back in time and producing something out of nothing). Like my airbases uses as an enargy sheild, scouting missiles are like the unmanded spy planes used today and of course you can have two people working on the same job at once (engineer stack... why would anyone want to ban that one... perfect for building a quick railroad to the enmies capital

)
Actually the biggest cheat of them all is the switching the building production... in fact in one of my games nearlly all my later wonders, somehow had the same foundation.. thank of JS Bach Catherdral... though finshing people who would agree to that would be stupid... so we would just have to admit that everyone cheats.