You don't need to use the character config, it is for lazy people^^
Go into the Scripts folder and open Default and edit the part where it says:
load("bots/pwndefault.d2j");
After the ("bots/
type in the NAME OF THE BOT (found in the BOTS folder) THAT YOU WANT TO USE and LEAVE .D2J");
after it.
~EDIT: For the lil newbies..
load("bots/NameOfBotHere .d2j");
That should do^^
hey i deserve a kiss or something