I think it would be useful if we were able to either add folders/filters to the project hierarchy like you can do in MSVS, Code::Blocks, and pretty much all other IDEs. I personally would like the option to create either a virtual directory (one that is mapped to another directory) or a physical directory (either an new or existing folder).
The functionality of the feature could also be used to define the scope of the projects include, library, and binary paths.
For example:
+ Project
|
+---+ \Include (Maps to ${PellesC}\Include)
| |
| +---+ \sys (Maps to ${PellesC}\Include\sys)
| +---+ \win (Maps to ${PellesC}\Include\win)
+---+ \inc (Maps to ${Project}\inc)
+---+ \lib (Maps to ${Project}\lib)
+---+ \thirdparty (Maps to ${Project}\..\ThirdParty)
Well, tell me what you think.