This mod sets up all of the features you would have obtained at the end of the game before the first mission even begins. So you have all the advantages of a 100% finished game, while still being able to play through the storyline.

Features:
All stats upgraded to full
Entire map opened up without restrictions
All side mission bonuses unlocked (Oysters, Horseshoes, Vigilante, etc.)
Most properties available for purchase from the start
All parked vehicles available from start
All unlockable weapons and pickups available from start, including IR goggle fix
Gang wars available from start

This is a work in progress, but I invite anyone to use this as a base for their own work, provided they acknowledge the original author was myself. Source code is provided.

For install instructions and other notes, please see the readme inside the download.