[Click] specify DLT in FromDevice?

[Ian Rose]

Hello all -

I am new to this list - apologies if this question has previously be 
answered.  I am looking at the FromDevice element, but I see no way to 
specify a datalinktype (i.e. the equivalent of the '-y' flag in tcpdump). 
  Is there any reason that an argument for this was left out?  It seems 
pretty easy for me to add, but I wanted to check first to make sure I 
wasn't overlooking or misunderstanding something.

thanks,
Ian

p.s. I am running on FreeBSD, so I am using the libpcap-based code in 
FromDevice, as opposed to the Linux-based code.