[Radek]

You need not hack the game. It is possible to have more than one "home made" character in the party.
1. Start a singleplayer session.
2. Create all needed characters. Create one character, let the initial cut-off scene run, export the character, and start from scratch with a new character. You need not create all 6 characters.
3. With the last character, save the game so as you have a legally saved game on the disc. We don't want to investigate what tables the game keeps and where and what the tables contain.
4. Start a multiplayer session. Create new session. Lock it. Import all your characters (it is possible under multiplayer!) and give them all access rights.
5. Let the initial cut-off scene run and save the game.
6. Quit the game completely. Delete all files in the folder with the saved game from the singleplayer session (saved in step 3). Replace them with files from the folder with the saved game from the multilpayer session (saved in step 5).
7. Start the game in singleplayer and load the game saved in step 3. Right, the game which was saved under multiplayer will be loaded. You have more than 1 home made character in a singleplayer session.
This works perfectly. You can create your own party completely if you want. You can create only necessary characters, for example a protagonist and a character with thieving abilities according to your needs, and complete the party with standard characters from the game.
But beware. There are some but's about the custom characters:
1. They cannot be given their marching orders. Once you release them you lose them forever.
2. They must not be imprisoned or stoned. Well, you can free them or un-stone them but they will behave like released characters, i.e., they will say "Ok, I am leaving" and vanish from the game.
3. You cannot have love story with a home made character.
4. They will not give you any character specific information. For example, when they see Neb, they remain silent instead of crying "Neb? That swine?".
5. On the other hand, they will not complain about wasted time, your reputation, missing wings, your idea of helping others, and so on.