Shadowrun has not yet been extensively hacked.
No known utilities exist for editing Shadowrun. A text dumper has been written, however.
No known Shadowrun hacks exist.
Shadowrun makes use of apparent big-endian values in some of its data tables, an oddity on the Super Nintendo's little-endian architecture. Nearly all of the game's text is compressed via Huffman coding.
A dump of the compressed text
The source code for the text decompressor, written by Michael1 (Alchemic)