That is indeed the reason why I left it unimplemented, but the more I click on Qalendar's icon the more I see how impractical it is. 0.6.1 changes that, along with a few other details:

• If another instance of the application is detected on startup, activate that instance and exit.
• Replace line breaks with spaces when displaying text that is supposed to fit in one line.
• Gray out headings in the recurrence editor with the rest of the dialog.
• Updated the French translation.

Please note that Qalendar will not be automatically restarted after the update, so if you have it running in the background, you should kill it manually with "killall qalendar".