Using smbbf

Hi, I'm trying to password audit a windows 2000 machine across the network. 
I'm using smbbf to do this (windows version).  Here is the issue I am having:
 
The syntax I'm using is:
 
Smbbf -i 192.168.2.10 -u userlist.txt -p passwords.txt -v
 
This appears to do a dictionary attack, when I really wanted to do a brute 
force. I already know the passwords on the target machine, and they are not 
dictionary words. 
 
Is there a way to make smbbf use every keystroke, instead of reading from a 
password file like I have done above? If not, can someone recommend a free tool 
that can accomplish this?
 
Thanks
dissolved

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