Hi Hugues,
For the second bug you mentioned please do try updating to 3.3.1 in the first instance and see if that helps – but if not please create a new thread and someone will happily help if they can 🙂
For the first issue, for single day events you might find this snippet useful (which you could add to your theme’s functions.php file). Other alternatives include A) setting up a filter on the following hook:
tribe_events_event_schedule_details
Or B) replacing any calls to tribe_events_event_schedule_details() within the single-event.php template and elsewhere and replacing them with your own code. That’s a bit more involved of course, but the following resources could be useful if you want to investigate that route: