Hello Steven,
Thank you for your suggestion. We will think about how we could implement it.
Meanwhile, you can use the following workaround. Create to identical connections in your address book. By "identical" here I mean connections for accessing the same remote PC. When you open a connection and switch to a specific remote monitor using the corresponding toggle icon on the toolbar, the program remembers your monitor choice. The next time you connect through that connection you will see the monitor you've seen the last time.
So, you can view two remote monitors of the same remote Host side by side in your Full Control window as tabs, if you open both connections simultaneously, each one with its own remembered monitor.
Hope that helps.