I have a confession. I actually had the 'post scheduling' feature included in RavenPlus during development. But I had it removed a few days before releasing RavenPlus Version 1.0.505.
While under development, I noticed that one of my blog post had its URL set to my blog homepage. The reason (after much tracing): my PC was running about 60 seconds ahead of the Blogger/Blogspot server - it became a schedule post, which is technically correct. Because of this, I wrongly assumed that it was better to let Blogger/Blogspot set the publishing time of a blog post, rather than by RavenPlus, without realising that I had mistakenly taken the 'post scheduling' feature away.
I am now undoing my mistake with RavenPlus Version 1.0.506. My apologies.