Publishing with summary is counter-intuitive on blogs.kde.org: authors have to copy the summary to the body, otherwise it won't appear in the full content.
A sample: http://wstaw.org/m/2012/12/09/plasma-desktopvT2170.png
The editor is a matter of upstream, and we try to avoid hacking on core parts as far as possible. I agree that it is indeed suboptimal, and one can easily find more than one discussion about this fact. Anyway, marking this as upstream issue.