I am using Kixtart in a Win2k server environment. From my NT test PC, I used the SUBST command line that you mentioned and I received an Invalid Parameter error.

I've also tried other options, such as:

use k: @homedir ,or
use k: @homeshr ,or
use k: "\\test_\users$ /user:bcc\@userid"

...but no luck. I get a drive mapping to the share but not to the root of the user's home directory.