Where Can I Give Feedback on Ubuntu?
where to report improvements for some applications that have features which can be enhanced. Current behavior of such a feature should be working exactly as intended.
Many programs maintain their own bug tracker database, and these are generally the best places for not just feature requests but also bug reports. Many are documented at launchpad: https://bugs.launchpad.net/bugs/bugtrackers , but use your google-fu to find others.