Load menus and accelerators from a property file so they can be modified easily and localised into other languages. Allow file name based selection on all properties rather than just a chosen few. Opening from and saving to FTP servers. Setting to fold away comments upon opening. Features I am unlikely to do These are features I don't like or don't think are important enough to work on.
Implementations are welcome from others though.
Automatically saving modified menu shortcuts on exit. Adding options to the save dialog to save in a particular encoding or with a chosen line ending. The main point of this development is Scintilla, and this is where most effort will go. The lines I've currently decided not to step over in SciTE are any sort of project facility and any configuration dialogs. SciTE for Windows now has a Director interface for communicating with a separate project manager application.