Got carried away while doing something else. Just try it out. Talk to the girl with pink hair.
WARNING: Drains the CPU!
Screenshot:

Download link:
http://www.sendspace.com/file/4dfkpvKeys you might want to try out are, L, R, A, C
L - Reset
R - Screenshot (buggy)
A - Speed up cursor (during moving AND drawing)
C - Press to draw line
There's one more thing you need to do. Open Game.ini file and change RGSS100J.dll to RGSS102E.dll.
Note: For those who bother to open the script editor, you might find some extra stuff, I recommend you DO NOT USE THEM in your projects if you don't know what you're doing. Doing so might cause compatibility problems, and all those extras are still under development.
Comments are appreciated ^_^