Are you a coder offering to implement new features (like interactive tutorials, etc) or just offering advice? The former would be very welcome. The second can be useful, as well, but really everyone's got ideas.
Many of the usability issues will be addressed as we work to implement
UI2. That will probably not start until after 2.5 is released, but you'll have an opportunity to comment as that progresses.
Finally, if you're playing 2.4, you should consider using 2.5-dev. There have been some significant improvements in some of the more tedious management processes (equipping soldiers, managing transfers). But save games are not compatible between these versions.