I would like to add to my street faster than one click/reload, I would probably use the maximum expansion to the right of the house all at once if I could.
I would also not mind moving the house over a few clicks to the left, so that it really sits close to the street sign, and then all the rocks I'd put on my street can sit to the right of that.
So, I see that a street has whatever space it came with plus around 20 additional slots to add to it; I just would prefer to have the house left justified and all the extra space to the right of it to throw out goodies...especially feeders and collectors. I have thousands of those.