I found a solution to this problem by stumbling upon some random forum that I forgot to bookmark (and no, it wasn’t the official wordpress forum!). There were actually a number of different implementations listed to combat this issue, but the easiest was to simply add a <!--more--> tag directly into the post via the HTML tab.

This method assumes, of course, that you have a line in your html somewhere similar to:
<?php the_content('Read the rest of this entry »'); ?>

If not, you’ll need to add that to your post entry section. If you have no idea what I’m talking about, don’t fret, most (all?) wordpress templates already contain that line of code so you should be good to go.

Just to drive this point home, let’s pretend that you’re writing up a post on wordpress under the Visual tab and you currently have something like:

• Hello world!
• I like cake. I wish I had some.

And you want to add a ‘rtrotp’ link after ‘Hello world!’ Well, all you have to do is click on the HTML tab and insert the ‘more’ tag after the sentence. Now it should look something like this:

• Hello world!
• <!--more-->
• I like cake. I wish I had some.