Can't they already retile the map to "All Grass Tiles Lolz!" using third party clientside hacks? Hardly seems to matter.
__________________
"Whatever," said Bean, "I was just glad to get out of the toilet."
"Power does not corrupt. Fear corrupts, perhaps the fear of a loss of power."- John Steinbeck
"I'm only acting retarded, what's your excuse?" queried the Gord. - My pet, the Levelup Gnome
It seems simple enough in theory to add... The only problem I see is if people find a way to modify the properties of tiles via a 3rd party program (memory editor or something) then they could change blocking tiles to non-blocking and that could cause some big problems.