Have you checked these out yet?

http://www.lsoft.com/manuals/1.8d/owner/appendb.html#keyAutoDelete

http://www.lsoft.com/manuals/1.8d/owner/owner.html#4.7

http://www.lsoft.com/manuals/1.8d/owner/owner.html#4.8

and the ever popular:

http://peach.ease.lsoft.com/scripts/wa.exe?S2=lstown-l&q=auto-del&0=S&s=&f
=&a=&b=

/Pete