Thank you for this really useful tool. On my wish list I would like a warp mode, like the City tool, and the ability to select certain features to be present, like a square, or church.
Cheers! Implementing a warp mode exactly like in the city generator is not possible here, but I'll probably add the ability to draw (or edit) the outline of a neighbourhood. You can request a square by selecting the "square" tag in the Tags dialog.