Hey, everyone! I have re-organized the list and hope it's a bit easier to follow now. I have also added many of your contributions. There are a few that I want to discuss further:
Manssom, I don't like the default gallery images either. However, I'm hesitant to add this as a request to EA because I can understand why it is set up the way it is and why they might not want to change it. I'm guessing that the primary reason is to prevent posting unsavory or irrelevant images. I also think that we will eventually get a program or mod to do this like we had in TS3 anyway. I'd like to take a "wait and see" approach on it for now.
GreenLion, you asked for upside down roofing. I think you may be able to do that, to an extent, with the roofing tools that we have now. In addition to height adjustments, we can also make adjustments to make the roofs more concave or convex. Have you experimented with it much? Also, I think I know exactly what you mean about the window pieces you mention; like the ones they released in TS3 via the store, right? Those were definitely nifty, and I'd like to see them make a comeback, but I would predict it to be store content again (or maybe in another futuristic expansion).
Yanti, you asked for bigger neighborhoods. I would like to see that too, but I am also okay with just adding lots more small neighborhoods. Since sims can travel across all of them, and with the way they have engineered TS4, I'm just not sure big neighborhoods make sense or are possible anymore...