A trainer would be nice, but won't they have cheats/codes anyways? For games like this, I seem to remember Maxis and/or EA always having a type of cheating system built into the game. I know it's online and your progress is tracked but hopefully they will have a type of "cheat mode" or option where your city and/or progress doesn't wind up on the leader boards.
The game is like Diablo 3, everything is handled by the game servers, changing your money,... data would be like hacking the servers.
See what happened to Diablo 3 trainer... does nothing of any use... No infinite life, no infinite mana, skill point free, gold,level and so... impossible to edit because it's server managed.
Sim city is exactly the same. The servers do everything so don't count on a trainer.
sadly as long that there games sells the dont give a rats bib. And even tho a lot of person are outrage on the forums there games still sells. just look at D3.