First let me congratulate you.
I love Notepad++ and use it since years and it only gets better, keep on.
I converted scores of people to using it.
There are a couple of small features which would make Notepad++ even better for me:
It would be great if one could use an inbuilt language as a starting point for a user defined language, I have to deal with several weird proprietary languages, which resemble closely C++ or xml.
I also would like to see an easier import/export for user defined languages from within notepad++ (as opposed to copy/paste from an xml file) as was suggested earlier (import/export for the style configurator would also be nice).

Thanks again for this nice program
Ralf