I'd guess the main reason for no graphic support is all the different types of graphic LCD's out there. If MELabs offered support for say the KS0108 type, people would want some other LCD variety supported too.

The graphic LCD's are really fairly easy to use if you read the data sheets several times (the data sheets are typically pretty poor translations).

There is also a web-site with some sample code:

http://www.compsys1.com/workbench/

Writing your own code allows you to tailor everything to your specific needs, without filling up a whole '876!