1) We don't know of any software that limits the amount of disk space that a user or folder can occupy
2) Any software that creates true partitions on a hard disk should work properly with the AppleShare File Server software. Silverlining, from La Cie, is an example of software that creates true partitions on a hard disk that work with the AppleShare File Server software. Software that creates a file on the hard disk instead of a true partition may not work. SUM Partition software, from Symantec, creates an invisible file on the hard disk and makes it appear as a separate volume to the Macintosh file system. AppleShare recognizes this as a separate volume.
Other software may also work. Please check with the manufacturer or distributor of disk partitioning software for compatibility with the AppleShare File Server software. For more details, search the Technical Info library under "La Cie" and "Symantec."