I am agreeing with some of you here. And while reading, I came up with an idea. If it is good or not, I have no idea.
The idea of a NSI text editor by itself is a bit plain vanilla. The idea of a GUI to build and edit NSI scripts is a good idea.
Now lets jump out of NSI scripts, and look at HTML (bear with me here). You can do webpages with text editors, or you can use WYSIWYG editors, such as Dreamweaver, and Frontpage. Now, Dreamweaver, has a feature, where you can change what views you want. Code, Design, Code and Design.
It would be neat, to have a NSI editor, that did that. GUI + Code views. Just a passing thought that I had. Perhaps you, PabUK, and LiquidMotion could get together. Think he used, VB for SlateBlue.
Anyhow, good job Pab.