You saved my hide! My close friend is making me tiles and you had the sheet size, the way to do it and EVERYTHING. :D I am having her make the tiles and then I will arrange them as needed on the a tile template. :3
I will be testing this tomorrow when my husband is not on his computer, I will post any questions I have then, cannot wait to try it out. I think it is nice you are creating the engine to help others, you obviously have a lot of information on how eventing and scripting works. Great Job!
It would seem learning JS is not a know it all for making plugins. While it has enabled me to understand what I'm looking at, I still have to find the relevant information in the core scripts. This is much harder than learning JS IMO.