it might be, but looking at the history on the http://www.scintilla.org/ page there does not seem to be any benefit. my understanding is that this is only used for the autotext editor, so i don't see what you hope to achieve by doing this.
plus it would make supporting any bug reports a bit more tricky.
Feline is correct in that we use scintilla only for editing of autotext. If you really need to do some fancy editing, use a different, standalone editor. Our tpl files are plain text.