Is there a facility to send USB requests through the script?

[Yuri]

I am looking at the USB webcam device that doesn't work on BSD (stalls).
I have the log of linux USB communcation to the same device, where it 
works fine.

Is there a way I can send the particular requests to USB device through 
script, as a debugging facility, so that I can easily change what is 
sent, compare what is received to what I have in log, and make changes?
I know that kernel also sends some requests to the USB device, and I 
would like to disable this in such case.

Yuri