Maxis and Electronic Arts recognize the hefty portion of SimCity's popularity as a franchise is due to its mod community. The current version could use all of the help it can get after its unfortunate first year. They have finally let the community take over… to some extent. EA is imposing certain rules upon the content creators. Most of them are reasonable. One of them can have unforeseen consequences for the LGBQT community. The first rule should apply to their expansion packs.
Starting at the end, the last three rules (#3 through #5) are mostly reasonable. They protect EA against potential malware and breaches of their EULA and Terms of Service. The fifth rule does begin to dip its toe into potential censorship but it does not really concern me.
No-one can be "Best Friends" in North America.
The second rule, while mostly condemning illegal activity, does include the requirement that content remains within ESRB 10+ and PEGI 7. The problem with any content certification is that it limits the dialog between artists and society. In this case, references to same-sex topics (ex: Harvest Moon) in games may force a minimum T or M rating. A mod which introduces some story element where two Sims of the same gender go on a date or live together (again, like Harvest Moon) might result in interest groups rattling the ESRB's cage until EA draws a firm line on that specific topic.
EA is very good with the LGBQT community but this could get unnecessarily messy.
The first rule is a different story. It says that mods which affect the simulation for multiplayer games or features are not allowed (despite being the only official mode). They do not want a modification to give players an unfair advantage over the rest of the game's community.
You know, like maybe an airship which boosts "your struggling industry or commercial [districts]" and also brings in tourists and commuters without causing traffic on your connecting highway?
Maxis is still, apparently, exploring options for offline SimCity experiences. Even if they allow a server preference to not affect the global economy, mods would be able to be quarantined to those areas. Great, problem solved. Instead, it is somewhat left up to interpretation what is allowed. To make matters worse, the current examples of mods that we have are purely cosmetic.
SimCity is nowhere near as bad as Halo 2 Vista for its mod functionality (those mod tools were so hobbled that its own tutorial was impossible). It could actually be good. These are just areas for EA to consider and, hopefully, reconsider.