[GrowlZ1010]

Indeed, you can. At least, you could in theory. The file in question is arrays.dat, and is located in your Graal folder. I say "in theory" because the system the file uses to store tiletypes is pretty complicated and would take quite a while to work out, and even then Graal may well read its checksum, find out that the file is different, and refuse to open it - past versions didn't allow you to edit commands.rtf. However, at present, I don't think there's a way of using script commands to temporarily switch it around; it must be actually replaced by another version.