Hello,
I have created a rudimentary NotePad++ language definition for KSP. Now I have a way to edit with syntax hilighting :)
To use this file, first change the file extension to .xml, then in NotePad++ go to Language → User-defined language → Define your language... and click "import". After importing, click "save as" and name it KSP, then restart NotePad++. KSP should then appear near the bottom of the Languages menu.
I have to copy and paste my whole scripts into Kontakt after every change, but it's worth it to use a larger and more colourful editing window.