I've made a save editor with the use of PFM Library.
My part of the code is released under the WTFPL.
REQUIRES .Net Framework 4.5.1
Update: 17/09 quickfix for improperly saving skill information Update: 25/09 Added ancillary editing and army editing Update: 27/09 fix army stats saving Update: 09/02 completely rewritten. added army unit editing Update: 12/07 fixed bugs and updated schema and packfilemanager dlls