(1) For specifics about Npp's settings xml files:

Where are Notepad++ settings saved?
http://notepad-plus.wiki.sourceforge.net/FAQ

(2) Remains... Making NppLW's console talk with the context minimal
installation in /opt/context

In the meantime, you can edit your files with NppLW and compile through a
terminal window.

-- 
Best,
Alan

Ubuntu 8.04 Hardy Heron (Desktop)
* ConTeXt ver: 2008.09.16 19:49 MKIV fmt: 2008.9.20 int: english/english
(ConTeXt minimals installation)
* texexec --lua foo