Sorry it took so long, but I've added the cobwebs, trapdoor, snow block, and dead shrub. The fern and tall grass don't seem to be placeable at the moment and always appear to place dead shrubs. http://www.minecraftwiki.net/wiki/Tall_Grass backs this up. Is there anything else I've missed?
I also believe that the issue with tall grass and leaves, is that there has to be a damage setting in order to specify which item it is.
The damage should be put in correctly depending on the type of grass you selected. Wool colors, wood, etc. work exactly the same way and work fine.
As for biomes being messed up, I haven't experienced that and don't think my editor could even do that. Can you give me more details on what you're seeing there?
I haven't had a chance to test them yet (though they should work fine), but I added maps, shears, pistons, and sticky pistons. Change the maps' damage to change which ones are linked together (maps with same damage are linked).
It doesn't work for me.
when I have nothing but wood in my inventory, it doesn't show it. then, when I have more, it shows them and thinks I have whatever I added if I upload the file again, but it never shows up in-game. help!