Do the following:
1. Press ~ to bring up the console
2. Type in DebugMode 1
3. Type in rs ga_party_limit(x) where x is how many NPCs you want to have in your party (eg if you want a six-character party then type in 5)
4. Type in DebugMode 0 (to close Debug Mode)
5. press ~ to close the console
Now you will be able to have more NPCs in your party. Be warned, this will have some effect on framerate though (not too much for me, but I have pretty much all my options turned off anyway).
__________________
|