Thanks for your reply.
1. Yes, of course. When I enable Joomla Search Engine Friendly URLs, with the menu item to event details Jevents goes to "eventsbyday" list, while (with the mouse over the menu item) status bar shows "blablabla/eventname/eventdetail.html". I've upgraded from jevents 2.2.
2. I had a look at the jevents database tables. It seems to me that event details menu link points to #__jevents_repetition.rp_id. From my point of view, event details should point to #__jevents_vevent.ev_id otherwise it is not a "event details" type menu link but it is a "event date" (or "event repetition") type menu link. It is not only semantic matter of course, from this depends everything.