I'm not really clear on what exactly you're trying to do here. TG2 supports arbitrary terrain sizes, although some functions do not work well with terrains that are not one of the standard sizes (127, 257, 513, 1025, 2049, or 4097 pixels square). Imported textures, used with the SOPack plugin, can be of any size. Any terrain or texture size that fits in memory can be rendered and the resulting image can also be of any size.
If you can explain your problem more specifically it will make it easier to help.
- Oshyan