this would prevent road griefing and unnecessary roads. plus, this is an unnecessary feature to have be unrealistic. it's not more tedious to use 2 bricks to road, it's just realistic and adds more value to building (as well as prevent griefing)
Anyoen want to see the whole world covered in roads? I can make that happen right now, with nothing but a lot of time on my hands. No tools to road, no bricks....Please make roading harder
edit: if 2 bricks is too many, 1 certainly isn't.