I complete most of my workflows on my Mac, including using PiCal.
So I would be grateful if you could optimize the app for Macs.
Currently, the tab title says "Title" and some buttons (including the "back" one) get freezed from time to time, which makes me have to restart the app to get it work properly again.
This is in our plans, but we first need the iOS app to reach something like its "final form" before we optimize other platforms (iPad is on the list too), otherwise each change we make to the iOS version will require cascading support for every other platform. Which is fine if there aren't a lot of changes, but slows down all development otherwise. In the meantime, not sure you know this (we should make this clearer) but you can still use your regular calendar apps (Google, iCal) on desktop and changes you make will be reflected in PiCal. You will find checklists in the Notes field. Be aware though that if you make changes there, the format needs to stay exactly the same so PiCal can still read it (don't add extra spaces or characters between checklist lines and so on)
Here's a relevant screenshot