making fink functioning at work

Trying to make fink download packages with cURL through a MS ISA proxy that requires NTLM authentification.
What is funny, cURL itself can pass through such a proxy (I've succesfully downloaded a file), but fink can't call curl with correct options. And no mention on such a problem neither in Google nor in fink-users mailing list... I've joined it and even wrote a letter, but not sure there'll be any result...