Add XP
Start the game with the command-line parameter -console. (eg, C:Vampirevampire.exe -console). Then during gameplay in Single Player Mode, press ~ and type xp #, where # is the amount of XP you wish to add to your character.
Auto-save
If you cannot save at a particular location, enter a gate to another waypoint. The game will auto-save and allow you to load from this point if you die. Note: To enabling saving at a particular location, update the game to v1.1.