[Zope] import folder at other place than root

[peter be]

Is it possible and how to change the folder that the Zope interface use for importing zexp files?

I "host" friends on my Zope site, but I can't let them have access to my import folder which is in C:\Program\Zopesite\import
At the moment my friends have to email me their zexp files, if they for example want to upload something they've been working on locally.

Can I not edit the line where the Zope source code says that it expects zexp files from.
Ex. 
From:
importfolder = C:\Program\Zopesite\import 
To:
importfolder = D:\otherdomain\or\host\folder
Or:
importfolder = "http://www.hostfriends.com/zopeimport"

Ideas?