[Scribus] Setting Linescreen

[Wayne Maeda]

Anyone know how I can set the linescreen through Scribus whenever I print to 
an HP Laserjet 1300 (postscript emulation) printer? I need to print some 
newspaper ads (75-85 lpi) and can't figure out how to do this in Scribus. 
CorelDraw (in Windows) will set the linescreen on the same printer but 
Acrobat5 (both Linux and Windows versions) will not. Please let me know if 
I'm missing something here.

Thanks,
Wayne
Scribus 1.1.4
Mandrake 9.2