Many people already use IDEs such as Borland, Visual Studio, and eclipse. It would be helpful if you could offer a degree of compatibility with these environments: colour schemes, key bindings, import and export project files, ...
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Alex: partially this already added, at least color scheme:
http://www.hippoedit.com/color_schemes.php
it also possible to add VS adopted keyboard mapping, http://www.hippoedit.com/keymaps.php
but not yet done
For export/import, do not know if this is really needed