Both, PNut and FlexGUI have a rather "Spartan style" user interface, until now. I think it would be nice to add some colours and all the goodies we are used to from the old Propeller tool that make life much more comfortable. I know, at the moment functionality and bugfixes have priority over cosmetics. So don't take this as complaint about missing features but rather as sort of private wish-list that can wait until next christmas...
- A "recent files" menu would be nice, orr an option to load the last top level file at startup. I often switch between different projects so each time I have to browse through the directory tree.
- A navigation list of the file hierarchy (dependency tree with objects and sub-objects) of the current project would also be handy. It allows to quickly open the files you need to edit once the top level file is compiled
- Syntax highlightning helps to spot typos and syntax errors quickly. You know it... You edit a part of code and wonder why nothing happens. Then you find out that the whole part was commented out. With syntax highlighting you'd notice this immediately. There are some open source editors with configurable syntax parsers. If this is too much work simple scanning for reserved words, operators and comments would be sufficient for now.
- separate background colors for CON, PUB, DAT ... sections. This is unique to the Propeller Tool. It makes the editor window look a bit like a candy shop but I like it. You can scroll through large files and find the section you look for faster.
... to be continued.