I think this is just a quick add to CVS, but you probably don't want me messing in there...
I had the need to upload students, add fake e-mail addresses, but flag them as disabled. I added the emailstop parameter and the import worked great!
In admin/uploaduser.php, could we please add the emailstop parameter around line 96:
maildisplay => 1,
emailstop => 1,
htmleditor => 1,