Each tile is 16x16 with a maximum size of 512x512. Tile A is a special set of auto tiles that is made of up of 3 different tiles I believe. To add tile sets you have to replace them by naming them, 'tileB','tileE, etc. You can only have 5 tile tabs.
For more than 4 battle members:
http://anonymouscreations.we.bs/scripts/kg...-02-15-2009.txt