At least their stats can be edited very easy.
Go into the 7,62 Root folder, and locate the "ActorsINI" folder.
In there are a bunch of Ini´s which can be editied with every basic text programm(like Wordpad).
The mercs are actually listed with their real names so "Devnet Hansen.Ini" is the file for the Merc "Dessert".
The settings for your main char are found in the folder "Presets" in the "ActorsIni" folder.
The actual meaning of the abbreviations used in the Ini´s can be found here somewhere.
Edit : here they are
http://forum.1cpublishing.eu/showthread.php?t=16021
Dunno bout money though..