It would be great to have an agenda view (à la Google Calendar/Sunbird/Owncloud/Android) on the calendar pane. Currently osmo highlights days that have tasks attached to them but you have to select the day to show the task list. An agenda view could allow checking your upcoming tasks at a quick glance. It's also easier to edit/move events.
There could also be a switch allowing to cycle through day/week/month views.
The default android calendar app is a good example of a nice agenda view.
If you don't have an android device, I can provide screenshots.
I may create a quick mockup to soo how it would integrate into osmo.