Suggestion for calendar integration
I have noticed that some users think that the iCal support is not good enough since it syncs only once per day. I recently started using the Sunrise calendar it to solve the same problem with Evernote reminders. It works very well and now I can set date and time for the reminder in Evernote and it shows up in Sunrise almost instantly. Connecting Sunrise and Todoist might be the easy (?) solution to calendar integration you have been looking for.