The 1024px limit and multiple of 4 is a texture problem on the Wii. So it's not related to GRRLIB.

If your not clever enough to split your 2048px image in to two rows to make it 1024 pixel, that's not not our problem.

Taken from the code:

/**
 * Initialize a tile set.
 * @param tex The texture to initialize.
 * @param tilew Width of the tile.
 * @param tileh Height of the tile.
 * @param tilestart Offset for starting position (Used in fonts).
 */

So it means that if your fist char in your image is a space (32 in ASCII), you need to set the offset at 32.

If the comments in the code are too hard to read, download the documentation: http://grrlib.googlecode.com/files/doc%204.0.0.zip

Physx wrote:

The 1024px limit and multiple of 4 is a texture problem on the Wii. So it's not related to GRRLIB.
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All the more reason to support True Type Fonts

If you need an example of code with TTF check my code: http://wiibrew.org/wiki/Wii-Tac-Toe
Or make a search for FreeType on this forum.

There is a simple implementation of GRRLIB + libfreetype available here: http://wiibrew.org/wiki/File:Grrfreetype.zip

I never used it, so I might not be able to help you.