ibu: Kobo has implemented suggestions that were posted to these forums before (though I can't say whether it is because of these forums). That said, your suggestions may be outside of the market that Kobo's developing for.

That said, the developer forum has both mods for nickle (Kobo's interface) and there is an open source reader in the works (which will make it easier for people to implement your suggestion). The forum is also frequented by non-developers and developer wannabes (like me) too. Everyone seems to be welcome in there, and almost any contribution has been welcomed -- since things like bug reports and advice to new users are handy to the people who write the software.