The current implementation of the Personal LaserWriter LS driver is limited
to the 25% reduction increments, and there is no way to modify this.
A possible workaround is called DynoPage, by Portfolio Systems, Inc. In
addition to reduction options, it allows double-sided printing and printing
to any page size. It can be extended to user-specified page layouts.
On AppleLink, you can find contact information for the various vendors by
clicking the Library Index button to view the folder structure in the Tech
Info Library. An alphabetic listing of vendors is in the Third Party
Company Directory folder.