Thank you so much for pointing out a fantastic plugin I hadn't found yet!
Unfortunately I didn't correctly describe what I was looking for. Your example was indeed a horizontal view option.
However, what I meant was instead of two columns in the story view, have two rows, where once you set the ratio (say 50/50) both will create a scrollbar if needed so you aren't scrolling the entire story view.
Stroll's Shift+Left click option to open a tiddler in the secondary column, plus a two row story view (versus the current two column story view in Stroll), with the top row being set to Zoomin? Oh that type of interface for the project I"m working on just makes me drool so much.
However, I have since transitioned from trying to find the "perfect" interface (which would be based on my opinion) for my project and am now just working on the functionality. I'll let the user decide what interface plugin they want to use based on their own preferences.
Thanks again!