In the newest version I've added support for recurring posts. It's quite flexible, see for yourself:

It also shows a preview of next post times so you can be sure you've got it right:

Other features

• You can now schedule an unpin of a post that you are creating - meaning you can do both on one screen and more importantly, you don't have to wait until the post is posted to be able to unpin it
• I've started some ground work to support uploading images to other hosts instead of always uploading it to the target instance but that's gonna take a while.