Tile Organization

Hey, I got this program a while ago and have really loved playing with it. But I wanted to suggest keeping a -page- of tiles rather than a linear list. I find it helpful to organize my tilesets in some logical fashion (full water tile in the middle of its four edges with four corners on the corners, etc etc), but it's difficult to do so when I have to make changes to the size of the tile sheet and everything gets rearranged. I was thinking, if each tile had an X and Y coordinate, you could forego the whole "make my tile set X tiles wide" and simply place and position tiles in real time. Grouping tiles for organization would be another boon, but in my mind less vital than a coordinate-like system.