Well, here, bug reports may get lost, as a forum is not the best kind of tracker, let alone a single thread. So yes, typically this will suffice to make developers aware, but if it isn't too much of a hassle for you (or other interested people), create an account on Github and report here:
https://github.com/koreader/koreader/issues - don't let the techno-talk in some of these issues pull you off. Any bug report is welcome, and when developers see that it is already reported or is actually desired behaviour, a short note is given and the issue is closed again. Feel invited to use these reporting facilities!