Backpacks would be awesome!!!! And maybe you could get bigger and bigger ones for more moneyI agree that you should be able to choose where to put houses, and having more than one town on a cartage would be interesting.
But I think backpacks would be cool. Like, you could buy it as an accessory and when you wear it you have extra space to carry things. It'd be pretty helpful when you're collecting things to sell or catching bugs/fish. It'd probably look cute on your character too~
You should be able to rotate ground patterns so you don't use up 4 spots for the same corner piece. And be able to rotate some PWP.
I wish I chose a better map when I started, I didn't think I would be putting so many paths and PWPs in my town, but now the layout is annoying. I also wish I didn't put my house in this very small part right in front of the train tracks and right behind the river, there's no space.