Alright, with 0.3.4 I can now see and create davdroid contacts. However, If I edit them, I cannot add any fields, like phone number etc. I can only edit already present fields. For instance, if I create a contact named Test User, it is correctly synced. However, I cannot add a phone number to the already present contact Test User.
Finally, it seems that when adding a new syncronization account, it is automatically filtered, so to make the contacts visible, I have to disable the filter.