Feature requests have been moved to GitHub: https://github.com/openMSX/openMSX/labels/feature%20request (for openMSX), https://github.com/openMSX/wxcatapult/labels/feature%20request (for wxCatapult) and https://github.com/openMSX/debugger/labels/feature%20request (for the GUI debugger).
Please use those to submit a feature request. Alternatively, contact us on IRC: #openMSX on irc.freenode.net or post in the forum http://www.msx.org/forum/semi-msx-talk/openmsx
Thanks.