You would creately increase your users capability for writing the scripts if you added highlevel statements such as those used in QBasic.

i.e.

Line (10,10)-(100,100),1,b,10

If your going for a scripting language a lot of these highlevel statements makes sense. Since a person coding it will not have to worry about memory management and other low-level concerns. Most common programming languages simply allow for the manipulation of memory such as C/C++, Java, Pascal, and their statements do not give any support for graphics or input devices. Although Java has built in classes which handle all of that for you. You should either build them in to your objects or into the statements.