Gave this a whirl today, with a US cartridge. It looks like you might be working on the editor right now, because I uploaded the same dump twice and got different results. Either way, the dump was off by 0x100 bytes. I generated a corrected dump with my own tools and it appears to show up.
Grass wear data is after the map data (about 0x6428 bytes after the start of the map data). FFs give you full grass, 00s give you desert, and any value inbetween appears to represent different stages of wear. Haven't figured out the exact length yet though, it seems to go on for longer than it should.
Items in the house are in a different block of RAM than the town data. Start looking around 0x10325CC of a full RAM dump (yours might be different due to region differences).
I'll contribute some item hex values when I get the opportunity.
Hey, don't suppose you can help me out? I'm trying to figure out how to get dirt paths down.