The Idea of bungie giving unlimited money and unlimited objects is being to generous. I think that would be a stupid idea because people would just stack the map to the bone. You have to make it with what you got. Limitness is to God. Its like making a whole new map, not a forged (modified) map.
Some good ideas that would be nice to add on it when your green scroller (grabbing thing) highlights an object, it would be nice to see what item you are highlighting, so maybe it could say the name of it on the top right hand screen. Sometimes I would grab the wrong object by mistake and mess up my whole masterpiece. This would be a safer way to grab or delete an object that you want.
When you merge two items together, maybe there could be something to "verge" the two items together forever, so it acts as one item.
* But this would be a cheating way to lower your item limit down. So it would have to still act as there are two items on the map
And even kooler would be to save those items as if you would save a game varient or map. So you could be able to make a full volcano and 'verge" them all together and save it.
* But then people would probobly sell them for Microsoft points.
Just ideas, but its all up to bungie.